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Wang B, Fei X, Yin HF, Xu XN, Zhu JJ, Guo ZY, Wu JW, Zhu XS, Zhang Y, Xu Y, Yang Y, Chen LS. Photothermal-Controllable Microneedles with Antitumor, Antioxidant, Angiogenic, and Chondrogenic Activities to Sequential Eliminate Tracheal Neoplasm and Reconstruct Tracheal Cartilage. Small 2024; 20:e2309454. [PMID: 38098368 DOI: 10.1002/smll.202309454] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Indexed: 03/16/2024]
Abstract
The optimal treatment for tracheal tumors necessitates sequential tumor elimination and tracheal cartilage reconstruction. This study introduces an innovative inorganic nanosheet, MnO2 /PDA@Cu, comprising manganese dioxide (MnO2 ) loaded with copper ions (Cu) through in situ polymerization using polydopamine (PDA) as an intermediary. Additionally, a specialized methacrylic anhydride modified decellularized cartilage matrix (MDC) hydrogel with chondrogenic effects is developed by modifying a decellularized cartilage matrix with methacrylic anhydride. The MnO2 /PDA@Cu nanosheet is encapsulated within MDC-derived microneedles, creating a photothermal-controllable MnO2 /PDA@Cu-MDC microneedle. Effectiveness evaluation involved deep insertion of the MnO2 /PDA@Cu-MDC microneedle into tracheal orthotopic tumor in a murine model. Under 808 nm near-infrared irradiation, facilitated by PDA, the microneedle exhibited rapid overheating, efficiently eliminating tumors. PDA's photothermal effects triggered controlled MnO2 and Cu release. The MnO2 nanosheet acted as a potent inorganic nanoenzyme, scavenging reactive oxygen species for an antioxidant effect, while Cu facilitated angiogenesis. This intervention enhanced blood supply at the tumor excision site, promoting stem cell enrichment and nutrient provision. The MDC hydrogel played a pivotal role in creating a chondrogenic niche, fostering stem cells to secrete cartilaginous matrix. In conclusion, the MnO2 /PDA@Cu-MDC microneedle is a versatile platform with photothermal control, sequentially combining antitumor, antioxidant, pro-angiogenic, and chondrogenic activities to orchestrate precise tracheal tumor eradication and cartilage regeneration.
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Affiliation(s)
- B Wang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - X Fei
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - H F Yin
- Department of Infection Management, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - X N Xu
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - J J Zhu
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Z Y Guo
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - J W Wu
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - X S Zhu
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Y Zhang
- Department of Orthopedics, Shanghai Yangpu Hospital, School of Medicine, Tongji University, Shanghai, 200090, China
| | - Y Xu
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
| | - Y Yang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
- Central Laboratory, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
- School of Materials Science and Engineering, Tongji University, Shanghai, 201804, China
| | - L S Chen
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, School of Medicine, Tongji University, Shanghai, 200433, China
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Ui Lee Y, Weon Wu J. Visualization of the optical spin Hall effect in out-of-plane refraction. Opt Lett 2023; 48:5988-5991. [PMID: 37966770 DOI: 10.1364/ol.507478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 10/25/2023] [Indexed: 11/16/2023]
Abstract
The traditional law of refraction defines the incidence plane as the plane including the incident beam wavevector and the surface normal vector at the interface of two different optical media. The optical spin Hall effect (OSHE) refers to the spin-dependent transverse shift of the refracted beam perpendicular to the incidence plane. In this Letter, we demonstrate that OSHE in out-of-plane refraction can be detected and visualized in the far-field, even at small and normal incidence angles. The extent of spin-dependent photon spatial separation induced by anomalous refraction can be customized by manipulating the 2D additive momentum from the metasurface. Experimental visualization of the OSHE confirms the existence of a new, to the best of our knowledge, plane to describe the OSHE of the refracted beam outside the incidence plane.
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Cao L, Yang J, Zhou M, Yu B, Lin Q, Yao Y, Wu HL, Zhu QW, Ye M, Xie H, Wu JW, Chen JY. Does Dual Anti-HER2 Therapy Increase Early Cardiac Toxicity in Comparison with Trastuzumab Alone in Breast Cancer Patients Receiving Adjuvant Radiotherapy? A Multicenter Retrospective Study. Int J Radiat Oncol Biol Phys 2023; 117:e166. [PMID: 37784767 DOI: 10.1016/j.ijrobp.2023.06.1002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Adjuvant trastuzumab in combination with RT has proved its safety in terms of cardiac events. Dual anti-HER2 therapy with pertuzumab is currently standard adjuvant therapy in N+ and high-risk N0 early breast cancer (BC) patients. Our study aims to find if it increases early cardiac toxicity compared with trastuzumab alone in BC patients receiving adjuvant radiotherapy. MATERIALS/METHODS Operable BC patients who received adjuvant radiotherapy (RT) and trastuzumab with or without pertuzumab between January 2017 and September 2020 in 7 Chinese centers were retrospectively reviewed. The cardiac examination included ultrasonography, electrocardiogram (ECG), NT-proBNP, and cTnI before RT and during follow-up. The cardiac event was any new-onset symptomatic heart disease or abnormality in the cardiac examination after RT. RESULTS In total, 711 patients with a median age of 52 years were included, of whom 567 (79.7%) patients were treated with trastuzumab-only and 144 (20.3%) patients received dual anti-HER2 therapy. Adjuvant RT was given concurrently in 140/144 (97.2%) of dual anti-HER2 therapy and 562/567 (99.1%) of trastuzumab alone, respectively. With a median follow-up of 11 months, no patients developed symptomatic heart diseases. Among patients with normal baseline, 17 (2.4%), 86 (12.1%), 18 (2.5%) and 14 (7.3%) developed new-onset diastolic dysfunction, left ventricular ejection fraction (LVEF) decline, abnormal ECG, and abnormal NT-proBNP, respectively. No significant difference was found between the trastuzumab-only and dual anti-HER2 cohort in the incidence of all kinds of new-onset cardiac events (all p > 0.1). Multivariate analysis showed that left-sided (vs right-sided) RT significantly increased the risk of ECG abnormality (HR = 2.32, 95% CI 1.62-3.32, p<0.001). Increased age was an independent risk factor for diastolic dysfunction (HR = 1.1, 95% CI 1.02-1.18, p = 0.0098). Dosimetric analysis showed that patients who developed any cardiac events had increased mean heart dose (397.67±251.08 vs 344.87±236.75 cGy, p = 0.032). A significant increase in risk of cardiac events was found in patients with mean heart dose > 450 cGy (HR = 1.55, 95% CI 1.17-2.05, p = 0.0024), V5 > 26% (HR = 1.51, 95% CI 1.09-2.09, p = 0.013), and V30 > 5.5% (HR = 1.49, 95% CI 1.09-2.04, p = 0.0117), respectively. Further analysis was done in the subgroup of patients treated with left-sided RT, internal mammary nodes RT, or anthracyclines, no difference in risk of cardiac events was found between trastuzumab alone and dual anti-HER2 therapy in concurrent with RT (all p > 0.05). CONCLUSION Compared with trastuzumab-only, dual anti-HER2 therapy does not increase early cardiac toxicity in combination with adjuvant RT in BC patients. Cardiac radiation exposure remains the primary risk factor associated with early cardiac toxicity.
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Affiliation(s)
- L Cao
- Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - J Yang
- Department of Radiation Oncology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - M Zhou
- Department of Radiotherapy, The Affiliated Changzhou Second People's Hospital of Nanjing Medical University, Changzhou, China
| | - B Yu
- Department of Radiotherapy, the Affiliated Jiangyin Hospital of Nantong University, Jiangyin, China
| | - Q Lin
- Department of Radiation Oncology, Shanghai Tenth People's Hospital, Shanghai, China
| | - Y Yao
- Department of Radiotherapy, Shanghai Ninth People's Hospital, Shanghai, China
| | - H L Wu
- Department of Radiation Oncology, Shanghai Tenth People's Hospital, Shanghai, China
| | - Q W Zhu
- Department of Radiation Oncology, Affiliated Tumor Hospital of Nantong University, Nantong, China
| | - M Ye
- Department of Radiation Oncology, Renji Hospital, Shanghai Jiaotong University School of Medicine, China, Shanghai, China
| | - H Xie
- Department of Radiation Oncology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - J W Wu
- Department of Radiotherapy, Shanghai Ninth People's Hospital, Shanghai, China
| | - J Y Chen
- Department of Radiation Oncology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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Chang C, Wu JW, Peng YS, Liu KX. [Artificial intelligence-assisted identification of mucus plugs in asthma]. Zhonghua Yi Xue Za Zhi 2022; 102:2647-2650. [PMID: 36096692 DOI: 10.3760/cma.j.cn112137-20220413-00790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Airway mucus plug is an important clinical feature of bronchial asthma and is related to the prognosis of the disease. Clinically, chest CT is a preferred tool for evaluating airway mucus plugs. At present, the interpretation of CT images relies on manual reading, but the airway mucus plugs of patients with bronchial asthma are mostly distributed in the small and medium airways, which are difficult to identify with the naked eye. In recent years, with the continuous progress of deep learning and big data technology, artificial intelligence (AI)-assisted image reading technology has been introduced into clinical application, which has significantly improved the efficiency and accuracy of mucus plug identification. Currently, AI-assisted airway mucus plug identification has been used in respiratory diseases such as cystic fibrosis, chronic obstructive pulmonary disease, and bronchial asthma. Therefore, the application of AI counting to mucus plugs in patients with bronchial asthma is of great significance.
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Affiliation(s)
- C Chang
- Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing 100191, China
| | - J W Wu
- Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing 100191, China
| | - Y S Peng
- Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing 100191, China
| | - K X Liu
- Department of Respiratory and Critical Care Medicine, Peking University Third Hospital, Beijing 100191, China
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Yeh SCA, Hou J, Wu JW, Yu S, Zhang Y, Belfield KD, Camargo FD, Lin CP. Publisher Correction: Quantification of bone marrow interstitial pH and calcium concentration by intravital ratiometric imaging. Nat Commun 2022; 13:1563. [PMID: 35302057 PMCID: PMC8931100 DOI: 10.1038/s41467-022-28925-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- S-C A Yeh
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - J Hou
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - J W Wu
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - S Yu
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - Y Zhang
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - K D Belfield
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - F D Camargo
- Stem Cell Program, Boston Children's Hospital, Boston, MA, USA
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA, USA
| | - C P Lin
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.
- Harvard Stem Cell Institute, Harvard University, Cambridge, MA, 02138, USA.
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Yeh SCA, Hou J, Wu JW, Yu S, Zhang Y, Belfield KD, Camargo FD, Lin CP. Quantification of bone marrow interstitial pH and calcium concentration by intravital ratiometric imaging. Nat Commun 2022; 13:393. [PMID: 35046411 PMCID: PMC8770570 DOI: 10.1038/s41467-022-27973-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 12/22/2021] [Indexed: 12/23/2022] Open
Abstract
The fate of hematopoietic stem cells (HSCs) can be directed by microenvironmental factors including extracellular calcium ion concentration ([Ca2+]e), but the local [Ca2+]e around individual HSCs in vivo remains unknown. Here we develop intravital ratiometric analyses to quantify the absolute pH and [Ca2+]e in the mouse calvarial bone marrow, taking into account the pH sensitivity of the calcium probe and the wavelength-dependent optical loss through bone. Unexpectedly, the mean [Ca2+]e in the bone marrow (1.0 ± 0.54 mM) is not significantly different from the blood serum, but the HSCs are found in locations with elevated local [Ca2+]e (1.5 ± 0.57 mM). With aging, a significant increase in [Ca2+]e is found in M-type cavities that exclusively support clonal expansion of activated HSCs. This work thus establishes a tool to investigate [Ca2+]e and pH in the HSC niche with high spatial resolution and can be broadly applied to other tissue types.
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Affiliation(s)
- S-C A Yeh
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - J Hou
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - J W Wu
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - S Yu
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - Y Zhang
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - K D Belfield
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, 323 Martin Luther King Jr. Blvd., Newark, NJ, 07102, USA
| | - F D Camargo
- Stem Cell Program, Boston Children's Hospital, Boston, MA, USA
- Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA, USA
| | - C P Lin
- Advanced Microscopy Program, Center for Systems Biology and Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA.
- Harvard Stem Cell Institute, Harvard University, Cambridge, MA, 02138, USA.
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Abstract
The microfluidic flow is typically laminar due to the dominant viscous effects. At Reynolds numbers far below 1 (Re ≪ 1), the fluid inertia can be neglected. For the steady flow of incompressible Newtonian fluids, it approaches linear Stokes flow. At intermediate Re, there exists a weak-inertia flow regime where secondary flows such as Dean vortices are accessible for microfluidic manipulations. Apart from the fluid inertia, other nonlinear factors such as the non-Newtonian fluid properties, concurrent flow of dissimilar fluids, compliant fluidic structures and stimuli-responsive materials can also cause intriguing flow behaviours. Through proper designs, they can be applied for a variety of microfluidic components including mixers, valves, oscillators, stabilizers and auto-regulators etc., greatly enriching the microfluidic flow control and manipulation strategies. Due to its unique working characteristics and advantages, nonlinear microfluidics has increasingly attracted extensive attention. This review presents a systematic survey on this subject. The designs of typical nonlinear microfluidic devices, their working mechanisms, key applications, and the perspective of their future developments will be discussed. The nonlinear microfluidic techniques are believed to play an essential role in the next generation of highly-integrated, automated, and intelligent microfluidics.
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Affiliation(s)
- H M Xia
- School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China.
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Bai ZQ, Zhu L, Chang HX, Wu JW. Enhancement of cadmium accumulation in sweet sorghum as affected by nitrate. Plant Biol (Stuttg) 2021; 23:66-73. [PMID: 32989911 DOI: 10.1111/plb.13186] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 09/20/2020] [Indexed: 05/22/2023]
Abstract
The Cadmium (Cd)-polluted soils are is an increasing concern worldwide. Phytoextraction of Cd pollutants by high biomass plants, such as sweet sorghum, is considered an environmentally-friendly, cost-effective and sustainable strategy for remediating this problem. Nitrogen (N) is a macronutrient essential for plant growth, development and stress resistance. Nevertheless, how nitrate, as an important form of N, affects Cd uptake, translocation and accumulation in sweet sorghum is still unclear. In the present study, a series of nitrate levels (N1, 0.5 mm; N2, 2 mm; N3, 4 mm; N4, 8 mm and N5, 16 mm) with or without added 5 μm CdCl2 treatment in sweet sorghum was investigated hydroponically. The results indicate that Cd accumulation in the aboveground parts of sweet sorghum was enhanced by optimum nitrate supply, resulting from both increased dry weight and Cd concentration. Although root-to-shoot Cd translocation was not enhanced by increased nitrate, some Cd was transferred from cell walls to vacuoles in leaves. Intriguingly, expression levels of Cd uptake and transport genes, SbNramp1, SbNramp5 and SbHMA3, were not closely related to increased Cd as affected by nitrate supply. The expression of SbNRT1.1B in relation to nitrate transport showed an inverted 'U' shape with increasing nitrate levels under Cd stress, which was in agreement with trends in Cd concentration changes in aboveground tissues. Based on the aforementioned results, nitrate might regulate Cd uptake and accumulation through expression of SbNRT1.1B rather than SbNramp1, SbNramp5 or SbHMA3, the well-documented genes related to Cd uptake and transport in sweet sorghum.
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Affiliation(s)
- Z Q Bai
- Shaanxi Key Laboratory of Chinese Jujube, Yan'an University, Yan'an, China
- College of Life Sciences, Yan'an University, Yan'an, China
| | - L Zhu
- College of Life Sciences, Yan'an University, Yan'an, China
| | - H X Chang
- College of Life Sciences, Yan'an University, Yan'an, China
| | - J W Wu
- Shaanxi Key Laboratory of Chinese Jujube, Yan'an University, Yan'an, China
- College of Life Sciences, Yan'an University, Yan'an, China
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Choi KR, Kim DH, Lee YU, Placide V, Huynh S, Yao D, Canard G, Zaborova E, Mathevet F, Mager L, Heinrich B, Ribierre JC, Wu JW, Fages F, D'Aléo A. Effect of the electron donating group on the excited-state electronic nature and epsilon-near-zero properties of curcuminoid-borondifluoride dyes. RSC Adv 2021; 11:38247-38257. [PMID: 35498060 PMCID: PMC9043959 DOI: 10.1039/d1ra08025c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Accepted: 11/22/2021] [Indexed: 11/25/2022] Open
Abstract
Epsilon-near-zero (ENZ) properties have been reported in organic molecular films. In particular, cyanine and squaraine films have been shown to exhibit ENZ properties in the visible spectral region with a strong 3rd order nonlinear optical response near the ENZ spectral region. Noting both cyanine and squaraine belong to the polymethine family, a series of six curcuminoid borondifluoride (Curc) derivatives were developed to examine whether such a polymethine character is positively correlated with the ENZ property of the organic films. Those Curc derivatives possess a Donor–Acceptor–Donor (D–A–D) architecture with acceptor, AcacBF2, located at the molecular center. The backbone of Curc is designed such that the donor strength can be tuned to transit between charge transfer (CT) and polymethine character. This balance between CT and polymethine character of the Curc series is examined based on the Lippert–Mataga plot. As donor strength in the D–A–D structure increases, CT character is less marked resulting in a more dominant polymethine character. The structural and optical properties of the Curc films with a thickness in the order of 30 nm were examined to correlate the polymethine character with the ENZ response. The results obtained in isotropic Curc thin films demonstrate that an increase of polymethine character associated with a stronger donor strength leads to an appearance/enhancement of the ENZ property in the visible spectrum range from 500 to 670 nm. Overall, this study provides useful guidelines to engineer new organic materials showing ENZ properties in a desired spectral range. Epsilon-near-zero (ENZ) properties have been reported in organic molecular films.![]()
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Affiliation(s)
- Kyu-Ri Choi
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Dae Hyeon Kim
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Yeon Ui Lee
- Department of Physics, Chungbuk National University, Chungbuk 28644, Republic of Korea
| | - Virginie Placide
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Steven Huynh
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Dandan Yao
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Gabriel Canard
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Elena Zaborova
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Fabrice Mathevet
- Sorbonne Universités, Faculté des Sciences, CNRS, Parisien de Chimie Moléculaire (IPCM), UMR 8232, Chimie des Polymères, 75005 Paris, France
| | - Loïc Mager
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
| | - Benoît Heinrich
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
| | - Jean-Charles Ribierre
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University, Fukuoka 819-0395, Japan
| | - Jeong Weon Wu
- Department of Physics, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Frédéric Fages
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Anthony D'Aléo
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France
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Li GY, Zhang RY, Pang MF, Liang ZR, Yang XP, Wu JW, Li ZJ, Liu G, Song R, Ding J, Wang Q, Qi XP, Qian SY. [Multisystem inflammatory syndrome in children: its current situation and potential direction in prevention and treatment]. Zhonghua Er Ke Za Zhi 2020; 58:780-783. [PMID: 32872722 DOI: 10.3760/cma.j.cn112140-20200611-00611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- G Y Li
- Center for Global Public Health, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - R Y Zhang
- Department of Immunology, School of Basic Medical Sciences, Capital Medical University, Beijing 100069, China
| | - M F Pang
- Center for Global Public Health, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - Z R Liang
- Center for Global Public Health, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - X P Yang
- Center for Global Public Health, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - J W Wu
- National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing 100050, China
| | - Z J Li
- Division of Infectious Diseases, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - G Liu
- Department of Infectious Diseases, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - R Song
- Center of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, China
| | - J Ding
- Department of Pediatrics, Peking University First Hospital, Beijing 100034, China
| | - Q Wang
- Department of Emergency, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
| | - X P Qi
- Center for Global Public Health, Chinese Center for Disease Control and Prevention, Beijing 102206, China
| | - S Y Qian
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing 100045, China
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11
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Demangeat C, Dou Y, Hu B, Bretonnière Y, Andraud C, D'Aléo A, Wu JW, Kim E, Le Bahers T, Attias A. σ‐Conjugation and H‐Bond‐Directed Supramolecular Self‐Assembly: Key Features for Efficient Long‐Lived Room Temperature Phosphorescent Organic Molecular Crystals. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011770] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Catherine Demangeat
- Building Blocks for FUture Electronics Laboratory, UMI 2002 CNRS-Sorbonne Université-Yonsei University Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
| | - Yixuan Dou
- Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA
| | - Bin Hu
- Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA
| | - Yann Bretonnière
- Univ. Lyon Ens de Lyon, CNRS UMR 5182 Université Claude Bernard Lyon 1 Laboratoire de Chimie 69342 Lyon France
| | - Chantal Andraud
- Univ. Lyon Ens de Lyon, CNRS UMR 5182 Université Claude Bernard Lyon 1 Laboratoire de Chimie 69342 Lyon France
| | - Anthony D'Aléo
- Building Blocks for FUture Electronics Laboratory, UMI 2002 CNRS-Sorbonne Université-Yonsei University Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
| | - Jeong Weon Wu
- Department of Physics Ewha Womans University Seoul 03760 South Korea
| | - Eunkyoung Kim
- Building Blocks for FUture Electronics Laboratory, UMI 2002 CNRS-Sorbonne Université-Yonsei University Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
- Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
| | - Tangui Le Bahers
- Building Blocks for FUture Electronics Laboratory, UMI 2002 CNRS-Sorbonne Université-Yonsei University Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
- Univ. Lyon Ens de Lyon, CNRS UMR 5182 Université Claude Bernard Lyon 1 Laboratoire de Chimie 69342 Lyon France
| | - André‐Jean Attias
- Building Blocks for FUture Electronics Laboratory, UMI 2002 CNRS-Sorbonne Université-Yonsei University Yonsei University 50 Yonsei-ro, Seodaemun-gu Seoul 03722 South Korea
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12
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Demangeat C, Dou Y, Hu B, Bretonnière Y, Andraud C, D'Aléo A, Wu JW, Kim E, Le Bahers T, Attias AJ. σ-Conjugation and H-Bond-Directed Supramolecular Self-Assembly: Key Features for Efficient Long-Lived Room Temperature Phosphorescent Organic Molecular Crystals. Angew Chem Int Ed Engl 2020; 60:2446-2454. [PMID: 33089921 DOI: 10.1002/anie.202011770] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Indexed: 01/21/2023]
Abstract
Long-lived room temperature phosphorescence from organic molecular crystals attracts great attention. Persistent luminescence depends on the electronic properties of the molecular components, mainly π-conjugated donor-acceptor (D-A) chromophores, and their molecular packing. Here, a strategy is developed by designing two isomeric molecular phosphors incorporating and combining a bridge for σ-conjugation between the D and A units and a structure-directing unit for H-bond-directed supramolecular self-assembly. Calculations highlight the critical role played by the two degrees of freedom of the σ-conjugated bridge on the chromophore optical properties. The molecular crystals exhibit RTP quantum yields up to 20 % and lifetimes up to 520 ms. The crystal structures of the efficient phosphorescent materials establish the existence of an unprecedented well-organization of the emitters into 2D rectangular columnar-like supramolecular structure stabilized by intermolecular H-bonding.
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Affiliation(s)
- Catherine Demangeat
- Building Blocks for FUture Electronics Laboratory, UMI 2002, CNRS-Sorbonne Université-Yonsei University, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Yixuan Dou
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Bin Hu
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA
| | - Yann Bretonnière
- Univ. Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, 69342, Lyon, France
| | - Chantal Andraud
- Univ. Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, 69342, Lyon, France
| | - Anthony D'Aléo
- Building Blocks for FUture Electronics Laboratory, UMI 2002, CNRS-Sorbonne Université-Yonsei University, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Jeong Weon Wu
- Department of Physics, Ewha Womans University, Seoul, 03760, South Korea
| | - Eunkyoung Kim
- Building Blocks for FUture Electronics Laboratory, UMI 2002, CNRS-Sorbonne Université-Yonsei University, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.,Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
| | - Tangui Le Bahers
- Building Blocks for FUture Electronics Laboratory, UMI 2002, CNRS-Sorbonne Université-Yonsei University, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea.,Univ. Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, 69342, Lyon, France
| | - André-Jean Attias
- Building Blocks for FUture Electronics Laboratory, UMI 2002, CNRS-Sorbonne Université-Yonsei University, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
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13
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Zeng YS, Qu SW, Wu JW. Polarization-division and spatial-division shared-aperture nanopatch antenna arrays for wide-angle optical beam scanning. Opt Express 2020; 28:12805-12826. [PMID: 32403770 DOI: 10.1364/oe.388951] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Accepted: 04/07/2020] [Indexed: 06/11/2023]
Abstract
Chip-based optical beam scanners hold promise for future compact high-speed light detection and ranging (LIDAR) systems. Many of the demonstrated chip-based optical beam scanners are designed based on diffraction-based waveguide gratings as on-chip antennas. The waveguide grating antenna, however, only provides a typical field-of-view (FOV) of roughly 10° by tuning the input light wavelength. In this paper, polarization-division and spatial-division multiplexed nanoantenna arrays are proposed to expand the FOV of on-chip antennas. The proposed device, based on silicon-on-insulator (SOI) platform, consists of three nanoantenna groups which are densely packed and fed by a common silicon nanostrip. It is demonstrated that the combination of the optical mode-multiplexing technique and the antenna engineering allows independent controls over the interactions between multiple nanoantenna groups and the waveguide. By proper engineering of the antenna dimensions, the proposed device achieves a FOV of over 40° within a 100 nm wavelength tuning range, almost tripling that of the conventional waveguide grating antenna.
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14
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Guo ZF, Lu XW, Yang F, Wu JW, Wang H, He C. [Significance of prostate central gland/total gland volume ratio combined with PSA in the diagnosis of prostate cancer patients]. Zhonghua Yi Xue Za Zhi 2019; 99:2836-2839. [PMID: 31550812 DOI: 10.3760/cma.j.issn.0376-2491.2019.36.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the significance of prostate central gland/total gland volume (PVc/PV) ratio combined with PSA in the diagnosis of PSA 4-20 ng/ml prostate cancer patients. Methods: Data of patients undergoing prostate puncture in Minghang Branch, Zhongshan Hospital from July 2015 to December 2018 were retrospectively analyzed. The anteroposterior, transverse and axial diameters of the prostate and the central prostate gland were measured by magnetic resonance imaging (MRI). The differences of tPSA, f/tPSA, PSAD and PVc/PV between the prostate cancer group and non-prostate cancer group were compared. Receiver operating characteristic (ROC) curves of prostate cancer diagnosis were plotted according to tPSA, f/tPSA, PSAD, PVc/PV alone and PVc/PV combined with tPSA, respectively, and the area under the curve (AUC) was calculated and compared using tPSA as the reference. Results: There was no significant difference in tPSA between the two groups (P>0.05). However, significant differences were observed in f/tPSA, PSAD and PVc/PV between the two groups (P<0.05). The AUC value of PVc/PV combined with tPSA, PVc/PV and PSAD was 0.901 2,0.866 7 and 0.848 1,respectively, which were statistically different from that of tPSA (P<0.05). The AUC value of f/tPSA was 0.716, which was not statistically different from that of tPSA (P>0.05). Conclusion: The PVc/PV ratio combined with tPSA can be used as an important reference index for the diagnosis of prostate cancer in PSA 4-20 ng/ml patients.
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Affiliation(s)
- Z F Guo
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University/Institute of Fudan-Minhang Academic Health System, Shanghai 201199, China
| | - X W Lu
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University/Institute of Fudan-Minhang Academic Health System, Shanghai 201199, China
| | - F Yang
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University/Institute of Fudan-Minhang Academic Health System, Shanghai 201199, China
| | - J W Wu
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University/Institute of Fudan-Minhang Academic Health System, Shanghai 201199, China
| | - H Wang
- Department of Urology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
| | - C He
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University/Institute of Fudan-Minhang Academic Health System, Shanghai 201199, China
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15
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Roh Y, Lee SH, Kang B, Wu JW, Ju BK, Seo M. Terahertz optical characteristics of two types of metamaterials for molecule sensing. Opt Express 2019; 27:19042-19049. [PMID: 31252836 DOI: 10.1364/oe.27.019042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/04/2019] [Indexed: 06/09/2023]
Abstract
We investigate spectral responses of two different terahertz (THz) metamaterials of double split ring resonator (DSRR) and the nano slot resonator (NSR) for molecule sensing in low concentration. Two different resonant frequencies of DSRR can be controlled by polarization angle of incident THz beam. For comparison of THz optical characteristics, two NSRs were made as showing the same resonant frequencies as DSRR's multimode. The monosaccharide molecules of glucose and galactose were detected by these two types of metamaterials matching the resonant frequencies in various concentration. NSR shows higher sensitivity in very low concentration range rather than DSRR, although the behavior was easily saturated in terms of concentration. In contrast, DSRR can cover more broad concentration range with clear linearity especially under high quality factor mode in polarization of 67.5 degree due to the Fano resonance. THz field enhancement distributions were calculated to investigate sensing performance of both sensing chips in qualitative and quantitative manner.
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Wan KR, Lai N, Ma JL, Li Y, Wu JW, Huang WX, Jiang M. [Quality assessment of the clinical practice guideline for diagnosis, treatment and prevention of pulmonary thromboembolism, 2018]. Zhonghua Jie He He Hu Xi Za Zhi 2019; 42:213-218. [PMID: 30845399 DOI: 10.3760/cma.j.issn.1001-0939.2019.03.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To assess the quality of the clinical practice guideline for diagnosis, treatment and prevention of pulmonary thromboembolism, 2018 in China, providing the references for updating and developing clinical practice guidelines of this field in the future. Methods: The quality of the clinical practice guideline for diagnosis, treatment and prevention of pulmonary thromboembolism, 2018 in China was assessed using the internationally recognized instrument Appraisal of Guidelines for Research and Evaluation Ⅱ (AGREE Ⅱ). AGREE Ⅱ instrument consisted of 23 items in six domains, followed by two overall assessment items. Each item was scored from 1 to 7. The final overall guideline quality considered all domain items. Results: The scores of the six AGREE Ⅱ domains were: Scope and purpose 76.4%, Stakeholder involvement 55.6%, Rigor of development 78.1%, Clarity and presentation 83.3%, Applicability 55.2%, and Editorial independence 66.7%. The guideline was recommended for clinical use. Among the 101 recommendations, recommendations based on Levels High, Moderate and Low evidence accounted for 7 (6.9%), 31 (30.7%) and 63 (62.4%), respectively. Conclusion: The methodological quality of the clinical practice guideline for diagnosis, treatment and prevention of pulmonary thromboembolism, 2018 in China was great, but the levels of evidence were not high. More efforts were urgently required to improve in Stakeholder involvement and applicability. Especially corresponding economic research evidence, as well as preferences of patients and the public should be considered in the future development of clinical practice guidelines.
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Affiliation(s)
- K R Wan
- Nanshan School, Guangzhou Medical University, Guangzhou 511436, China
| | - N Lai
- Guangzhou Institute of Respiratory Health, State Key Laboratory of Respiratory Disease, Department of Respiratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China
| | - J L Ma
- Nanshan School, Guangzhou Medical University, Guangzhou 511436, China
| | - Y Li
- Nanshan School, Guangzhou Medical University, Guangzhou 511436, China
| | - J W Wu
- Nanshan School, Guangzhou Medical University, Guangzhou 511436, China
| | - W X Huang
- Nanshan School, Guangzhou Medical University, Guangzhou 511436, China
| | - M Jiang
- Guangzhou Institute of Respiratory Health, State Key Laboratory of Respiratory Disease, Department of Respiratory Medicine, First Affiliated Hospital of Guangzhou Medical University, Guangzhou 510120, China
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Lu XW, Wang H, Guo ZF, He C, Wu JW. [The application of retroperitoneal laparoscopic nephron-sparing surgery in stage T(1b) renal cell carcinoma]. Zhonghua Yi Xue Za Zhi 2018; 98:3084-3086. [PMID: 30392268 DOI: 10.3760/cma.j.issn.0376-2491.2018.38.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the safety and feasibility of retroperitoneal laparoscopic nephron-sparing surgery (NSS) in stage T(1b) renal cell carcinoma (RCC) patients . Methods: Between March 2014 and June 2017, 52 stage T(1b) RCC cases (36 males, 16 females) treated with retroperitoneal laparoscopic NSS in Zhongshan Hospital and Central Hospital of Minhang District were enrolled and retrospectively analyzed, with a tumor size range of 4.0 to 6.8 cm, and a mean size of(4.7±0.45)cm.The anatomic characteristics of tumors, operative time, intra-operative blood loss, warm ischemia time, intra- and post-operative complications, length of hospital stay, and oncological outcomes were reviewed. Results: Only 2 cases converted to open surgery due to uncontrollable bleeding in operation. The rest 50 cases successfully underwent retroperitoneal laparoscopic NSS, with mean operative time of (122±20.86) min (range: 100-220 min), mean blood loss of (140±128.85)ml (range: 50-800 ml), mean warm ischemia time of (30±3.52)min (range: 25-42 min), pre-operative mean serum creatinine of (100±23.54)μmol/L (range: 65-148 μmol/L), mean serum creatinine three monthsafter operation of (104±30.84)μmol/L (range: 72-224 μmol/L), mean drainage of (180±82.33)ml (range: 80-550 ml), mean length of hospital stay after operation of (8±1.56)d (range: 5-15 d). There was no significant difference in renal function between pre- and post-operation (P=0.056). One patient suffered pulmonary embolism was cured conservatively. Fifty patients were followed up, among which 47 cases with malignant pathology were followed up for 3-29 months, and two of them suffered from pulmonary metastasis. Conclusions: After pre-operative comprehensive assessment of tumors, stage T(1b) renal cell carcinoma could be treated with retroperitoneal laparoscopic NSS safely.
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Affiliation(s)
- X W Lu
- Department of Urology, Minhang Branch, Zhongshan Hospital, Fudan University (Central Hospital of Minhang District, Shanghai), Shanghai 201199, China
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D'Aléo A, Sazzad MH, Kim DH, Choi EY, Wu JW, Canard G, Fages F, Ribierre JC, Adachi C. Boron difluoride hemicurcuminoid as an efficient far red to near-infrared emitter: toward OLEDs and laser dyes. Chem Commun (Camb) 2018; 53:7003-7006. [PMID: 28513655 DOI: 10.1039/c7cc01786c] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A hemicurcuminoid boron difluoride complex is used as an emitter in organic light-emitting diodes, showing far red/near-infrared electroluminescence with an external quantum efficiency as high as 2.1%. This dye blended in CBP thin films shows amplified spontaneous emission with a threshold of 22 μJ cm-2 at 750 nm, making this compound attractive for organic semiconductor lasers operating in the near-infrared region.
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Affiliation(s)
- A D'Aléo
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France.
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Lee KJ, Lee YU, Fages F, Ribierre JC, Wu JW, D'Aléo A. Blue-Shifting Intramolecular Charge Transfer Emission by Nonlocal Effect of Hyperbolic Metamaterials. Nano Lett 2018; 18:1476-1482. [PMID: 29369634 DOI: 10.1021/acs.nanolett.7b05276] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Metallic nanostructures permit controlling various photophysical processes by coupling photons with plasmonic oscillation of electrons confined in the tailored nanostructures. One example is hyperbolic metamaterial (HMM) leading to an enhanced spontaneous emission rate of emitters located nearby. Noting that emission in organic molecules is from either π-π* or intramolecular charge-transfer (ICT) states, we address here how HMM modifies ICT emission spectral features by comparing them with a spectral shift dependent on the local polarity of the medium. The 7.0 nm blue shift is observed in ICT emission from 4-dicyanomethylene-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran dispersed into a polymer matrix prepared on HMM multilayered structure, while no spectral shift is observed in π-π* emission from perylene diimide. In the frame of the Lippert-Mataga formalism, the blue shift is explained by the HMM nonlocal effects resulting from 8% decrease in refractive index and 18% reduction in dielectric permittivity. This phenomenon was also shown in a hemicurcuminoid borondifluoride dye yielding 15.0 nm blue shift. Such a capability of spectral shift control in films by HMM structure opens new prospects for engineering organic light-emitting devices.
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Affiliation(s)
- Kwang Jin Lee
- Department of Physics, Quantum Metamaterial Research Center, Ewha Womans University , Seoul 03760, South Korea
| | - Yeon Ui Lee
- Department of Physics, Quantum Metamaterial Research Center, Ewha Womans University , Seoul 03760, South Korea
| | - Frédéric Fages
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy , Case 913, 13288 Marseille, France
| | - Jean-Charles Ribierre
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zheijiang University , Hangzhou 310027, China
| | - Jeong Weon Wu
- Department of Physics, Quantum Metamaterial Research Center, Ewha Womans University , Seoul 03760, South Korea
| | - Anthony D'Aléo
- Department of Physics, Quantum Metamaterial Research Center, Ewha Womans University , Seoul 03760, South Korea
- Aix Marseille Univ, CNRS, CINaM UMR 7325, Campus de Luminy , Case 913, 13288 Marseille, France
- Center for Quantum Nanoscience, Institute for Basic Science (IBS) , Seoul 03760, Republic of Korea
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Kim S, Kim E, Lee YU, Ko E, Park HH, Wu JW, Kim DW. Strong Light Confinement in Metal-Coated Si Nanopillars: Interplay of Plasmonic Effects and Geometric Resonance. Nanoscale Res Lett 2017; 12:151. [PMID: 28249367 PMCID: PMC5328893 DOI: 10.1186/s11671-017-1932-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Accepted: 02/18/2017] [Indexed: 06/02/2023]
Abstract
We investigated the influence of metal coating on the optical characteristics of Si nanopillar (NP) arrays with and without thin metal layers coated on the sample surface. The reflection dips of the metal-coated arrays were much broader and more pronounced than those of the bare arrays. The coated metal layers consisted of two parts-the metal disks on the Si NP top and the holey metal backreflectors on the Si substrate. The Mie-like geometrical resonance in the NPs, the localized surface plasmons in the metal disks, and the propagation of surface plasmon polariton along the backreflector/substrate interface could contribute to the reflection spectra. Finite-difference time-domain simulation results showed that the interplay of the plasmonic effects and the geometric resonance gave rise to significantly enhanced light confinement and consequent local absorption in the metal-Si hybrid nanostructures.
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Affiliation(s)
- Sujung Kim
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - Eunah Kim
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - Yeon Ui Lee
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - Eunkyo Ko
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul, 120-750, Korea
| | - Hyeong-Ho Park
- Device Platforms Lab., Device Engineering Labs., Korea Advanced Nano Fab Center (KANC), Suwon, 443-270, Korea
| | - Jeong Weon Wu
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea
| | - Dong-Wook Kim
- Department of Physics, Ewha Womans University, Seoul, 120-750, Korea.
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Lee KJ, Xiao Y, Woo JH, Kim E, Kreher D, Attias AJ, Mathevet F, Ribierre JC, Wu JW, André P. Charge-transfer dynamics and nonlocal dielectric permittivity tuned with metamaterial structures as solvent analogues. Nat Mater 2017; 16:722-729. [PMID: 28581481 DOI: 10.1038/nmat4907] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
Charge transfer (CT) is a fundamental and ubiquitous mechanism in biology, physics and chemistry. Here, we evidence that CT dynamics can be altered by multi-layered hyperbolic metamaterial (HMM) substrates. Taking triphenylene:perylene diimide dyad supramolecular self-assemblies as a model system, we reveal longer-lived CT states in the presence of HMM structures, with both charge separation and recombination characteristic times increased by factors of 2.4 and 1.7-that is, relative variations of 140 and 73%, respectively. To rationalize these experimental results in terms of driving force, we successfully introduce image dipole interactions in Marcus theory. The non-local effect herein demonstrated is directly linked to the number of metal-dielectric pairs, can be formalized in the dielectric permittivity, and is presented as a solid analogue to local solvent polarity effects. This model and extra PH3T:PC60BM results show the generality of this non-local phenomenon and that a wide range of kinetic tailoring opportunities can arise from substrate engineering. This work paves the way toward the design of artificial substrates to control CT dynamics of interest for applications in optoelectronics and chemistry.
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Affiliation(s)
- Kwang Jin Lee
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Yiming Xiao
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Jae Heun Woo
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- Center for Length, Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, South Korea
| | - Eunsun Kim
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - David Kreher
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - André-Jean Attias
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Fabrice Mathevet
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Institut Parisien de Chimie Moléculaire, UMR 8232, Chimie des Polymères, 4 place Jussieu, 75005 Paris, France
| | - Jean-Charles Ribierre
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Jeong Weon Wu
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
| | - Pascal André
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 03760, South Korea
- RIKEN, Wako, Saitama 351-0198, Japan
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Lee KJ, Woo JH, Kim E, Xiao Y, Su X, Mazur LM, Attias AJ, Fages F, Cregut O, Barsella A, Mathevet F, Mager L, Wu JW, D'Aléo A, Ribierre JC. Electronic energy and electron transfer processes in photoexcited donor-acceptor dyad and triad molecular systems based on triphenylene and perylene diimide units. Phys Chem Chem Phys 2016; 18:7875-87. [PMID: 26911420 DOI: 10.1039/c5cp06279a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the photophysical properties of organic donor-acceptor dyad and triad molecular systems based on triphenylene and perylene diimide units linked by a non-conjugated flexible bridge in solution using complementary optical spectroscopy techniques. When these molecules are diluted in dichloromethane solution, energy transfer from the triphenylene to the perylene diimide excited moieties is evidenced by time-resolved fluorescence measurements resulting in a quenching of the emission from the triphenylene moieties. Simultaneously, another quenching process that affects the emission from both donor and acceptor units is observed. Solution ultrafast transient absorption measurements provide evidence of photo-induced charge transfer from either the donor or the acceptor depending upon the excitation. Overall, the analysis of the detailed time-resolved spectroscopic measurements carried out in the dyad and triad systems as well as in the triphenylene and perylene diimide units alone provides useful information both to better understand the relations between energy and charge transfer processes with molecular structures, and for the design of future functional dyad and triad architectures based on donor and acceptor moieties for organic optoelectronic applications.
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Affiliation(s)
- K J Lee
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, Korea
| | - J H Woo
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, Korea and Center for Length, Division of Physical Metrology, Korea Research Institute of Standards and Science (KRISS), 267 Gajeong-ro, Yuseong-gu, Daejeon, 305-340, South Korea
| | - E Kim
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, Korea
| | - Y Xiao
- Institut Parisien de Chimie Moléculaire, Chimie des Polymères, UMR CNRS 8232, Sorbonne Universités - Université Pierre and Marie Curie, 4 place Jussieu, Paris, France
| | - X Su
- Institut Parisien de Chimie Moléculaire, Chimie des Polymères, UMR CNRS 8232, Sorbonne Universités - Université Pierre and Marie Curie, 4 place Jussieu, Paris, France
| | - L M Mazur
- Institut Parisien de Chimie Moléculaire, Chimie des Polymères, UMR CNRS 8232, Sorbonne Universités - Université Pierre and Marie Curie, 4 place Jussieu, Paris, France and Advanced Materials Engineering and Modelling Group, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
| | - A-J Attias
- Institut Parisien de Chimie Moléculaire, Chimie des Polymères, UMR CNRS 8232, Sorbonne Universités - Université Pierre and Marie Curie, 4 place Jussieu, Paris, France
| | - F Fages
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France.
| | - O Cregut
- CNRS-IPCMS, Université de Strasbourg, 23 Rue du Loess, Strasbourg, France
| | - A Barsella
- CNRS-IPCMS, Université de Strasbourg, 23 Rue du Loess, Strasbourg, France
| | - F Mathevet
- Institut Parisien de Chimie Moléculaire, Chimie des Polymères, UMR CNRS 8232, Sorbonne Universités - Université Pierre and Marie Curie, 4 place Jussieu, Paris, France
| | - L Mager
- CNRS-IPCMS, Université de Strasbourg, 23 Rue du Loess, Strasbourg, France
| | - J W Wu
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, Korea
| | - A D'Aléo
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France.
| | - J-C Ribierre
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, Korea
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23
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Wu JW, Shen HL, Liu LM, Gao ZH. [Analysis of early failure of the PHILOS in proximal humerus fractures]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:683-685. [PMID: 29263513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE To analyze the reasons of early failure of the PHILOS in proximal humerus fractures. METHODS From Nov. 2010 to Nov. 2014, there were 117 patients with humerus fractures treated with PHILOS locking plate in Department of Orthopaedics, Xuanwu Hospital. All of the patients were treated with the plate by open reduction internal fixation, and we analyzed these cases retrospectively. After the operation, we removed the drainage tube within 48 h, and the patients were allowed to do the passive motion 3 days after the surgery if the X-Ray showed the plate and screws were reliable. Eight cases failed within 4 weeks after the operation. We analyzed the reasons of the failure. RESULTS The rate of the failed cases was 6.83%(8/117). The average age was 72.4(66-82) years. In the 8 failed cases, 3 were on the right side, and the other 5 on the left side. As for the reason of the fractures, 2 cases were because of car accidents, and the other 6 because of daily life injury. According to the Neer classification, 3 cases were 2-part fractures, and the other 5 3-part fractures. Three cases were total failure, and the other 5 partial failure. All the 8 failed cases failed within 4 weeks after the operation, of which 1 was on the sixth day after surgery, the other 7 2 to 4 weeks after the surgery.The 3 totally failed cases were treated by removing the screws and plates, the other 5 by conservative methods. All of the cases were malunion at the end. CONCLUSION The early failure of the PHILOS locking plate in proximal humerus fractures is related to the bad reduction during the operation, the loss of medial cortex support, the limitation of screw length, the osteoporosis and the improper rehabilitation after operation.It is very important to do good preoperative plan for a surgeon. During the operation, we should try our best in the fracture reduction, use the appropriate plate and screws, and then pay attention to the rehabilitation after the operation. After all of this, the rate of failure may be decreased.
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Affiliation(s)
- J W Wu
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - H L Shen
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - L M Liu
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Z H Gao
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
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Kim E, Cho Y, Sohn A, Hwang H, Lee YU, Kim K, Park HH, Kim J, Wu JW, Kim DW. Mie Resonance-Modulated Spatial Distributions of Photogenerated Carriers in Poly(3-hexylthiophene-2,5-diyl)/Silicon Nanopillars. Sci Rep 2016; 6:29472. [PMID: 27388122 PMCID: PMC4937449 DOI: 10.1038/srep29472] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 06/20/2016] [Indexed: 01/19/2023] Open
Abstract
Organic/silicon hybrid solar cells have great potential as low-cost, high-efficiency photovoltaic devices. The superior light trapping capability, mediated by the optical resonances, of the organic/silicon hybrid nanostructure-based cells enhances their optical performance. In this work, we fabricated Si nanopillar (NP) arrays coated with organic semiconductor, poly(3-hexylthiophene-2,5-diyl), layers. Experimental and calculated optical properties of the samples showed that Mie-resonance strongly concentrated incoming light in the NPs. Spatial mapping of surface photovoltage, i.e., changes in the surface potential under illumination, using Kelvin probe force microscopy enabled us to visualize the local behavior of the photogenerated carriers in our samples. Under red light, surface photovoltage was much larger (63 meV) on the top surface of a NP than on a planar sample (13 meV), which demonstrated that the confined light in the NPs produced numerous carriers within the NPs. Since the silicon NPs provide pathways for efficient carrier transportation, high collection probability of the photogenerated carriers near the NPs can be expected. This suggests that the optical resonance in organic/silicon hybrid nanostructures benefits not only broad-band light trapping but also efficient carrier collection.
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Affiliation(s)
- Eunah Kim
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Yunae Cho
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Ahrum Sohn
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Heewon Hwang
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Y U Lee
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Kyungkon Kim
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Korea
| | - Hyeong-Ho Park
- Applied Device and Material Lab., Device Technology Division, Korea Advanced Nanofab Center (KANC), Suwon 443-270, Korea
| | - Joondong Kim
- Department of Electrical Engineering, Incheon National University, Incheon 406-772, Korea
| | - J W Wu
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
| | - Dong-Wook Kim
- Department of Physics, Ewha Womans University, Seoul 120-750, Korea
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25
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Wu JW, Shen HL, Liu LM, Gao ZH. [Analysis of early failure of the PHILOS in proximal humerus fractures]. Beijing Da Xue Xue Bao Yi Xue Ban 2016; 48:683-685. [PMID: 27538152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To analyze the reasons of early failure of the PHILOS in proximal humerus fractures. METHODS From Nov. 2010 to Nov. 2014, there were 117 patients with humerus fractures treated with PHILOS locking plate in Department of Orthopaedics, Xuanwu Hospital. All of the patients were treated with the plate by open reduction internal fixation, and we analyzed these cases retrospectively. After the operation, we removed the drainage tube within 48 h, and the patients were allowed to do the passive motion 3 days after the surgery if the X-Ray showed the plate and screws were reliable. Eight cases failed within 4 weeks after the operation. We analyzed the reasons of the failure. RESULTS The rate of the failed cases was 6.83%(8/117). The average age was 72.4(66-82) years. In the 8 failed cases, 3 were on the right side, and the other 5 on the left side. As for the reason of the fractures, 2 cases were because of car accidents, and the other 6 because of daily life injury. According to the Neer classification, 3 cases were 2-part fractures, and the other 5 3-part fractures. Three cases were total failure, and the other 5 partial failure. All the 8 failed cases failed within 4 weeks after the operation, of which 1 was on the sixth day after surgery, the other 7 2 to 4 weeks after the surgery.The 3 totally failed cases were treated by removing the screws and plates, the other 5 by conservative methods. All of the cases were malunion at the end. CONCLUSION The early failure of the PHILOS locking plate in proximal humerus fractures is related to the bad reduction during the operation, the loss of medial cortex support, the limitation of screw length, the osteoporosis and the improper rehabilitation after operation.It is very important to do good preoperative plan for a surgeon. During the operation, we should try our best in the fracture reduction, use the appropriate plate and screws, and then pay attention to the rehabilitation after the operation. After all of this, the rate of failure may be decreased.
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Affiliation(s)
- J W Wu
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - H L Shen
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - L M Liu
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
| | - Z H Gao
- Department of Orthopaedics, Xuanwu Hospital, Capital Medical University, Beijing 100053, China
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26
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Lee KJ, Woo JH, Xiao Y, Kim E, Mazur LM, Kreher D, Attias AJ, Matczyszyn K, Samoc M, Heinrich B, Méry S, Fages F, Mager L, D'Aléo A, Wu JW, Mathevet F, André P, Ribierre JC. Structure–charge transfer property relationship in self-assembled discotic liquid-crystalline donor–acceptor dyad and triad thin films. RSC Adv 2016. [DOI: 10.1039/c6ra08039a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Dynamics of the photo-induced charge transfer are correlated with the structural properties of self-assembled discotic donor–acceptor dyad and triad films.
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27
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Zhao Y, Wang J, Thammaratsuntorn J, Wu JW, Wei JH, Wang Y, Xu JW, Zhao JL. Comparative transcriptome analysis of Nile tilapia (Oreochromis niloticus) in response to alkalinity stress. Genet Mol Res 2015; 14:17916-26. [PMID: 26782437 DOI: 10.4238/2015.december.22.16] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
To identify genes of potential importance to alkalinity tolerance, RNA sequencing (RNA-Seq) was performed to survey gill transcriptome profiles from freshwater (FW) and alkaline water (AW) exposed Nile tilapia (Oreochromis niloticus). A total of 22,724,036 (AW)/16,461,040 (FW) single-end reads were generated in which 20,304,348 (AW)/14,681,290 (FW) reads (90.0/89.72%) were aligned to the reference genome. Differential expression analysis revealed 302 up-regulated and 193 down-regulated genes between AW- and FW-exposed fish. These differentially expressed genes were enriched in several Gene Ontology (GO) terms related to "stress response", "heme binding", and "carbonate dehydratase activity". Meanwhile, significant KEGG pathways were enriched in energy metabolism, including nitrogen and sulfur metabolism. These results demonstrate the response of Nile tilapia exposed to alkaline-water and might provide valuable information to further understand the molecular mechanisms of adaptation of fish to alkaline environments.
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Affiliation(s)
- Y Zhao
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J Wang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J Thammaratsuntorn
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J W Wu
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J H Wei
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - Y Wang
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J W Xu
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
| | - J L Zhao
- Key Laboratory of Freshwater Aquatic Genetic Resources, Shanghai Ocean University, Shanghai, China
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Kim E, Felouat A, Zaborova E, Ribierre JC, Wu JW, Senatore S, Matthews C, Lenne PF, Baffert C, Karapetyan A, Giorgi M, Jacquemin D, Ponce-Vargas M, Le Guennic B, Fages F, D'Aléo A. Borondifluoride complexes of hemicurcuminoids as bio-inspired push-pull dyes for bioimaging. Org Biomol Chem 2015; 14:1311-24. [PMID: 26660280 DOI: 10.1039/c5ob02295a] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Hemicurcuminoids are based on half of the π-conjugated backbone of curcuminoids. The synthesis of a series of such systems and their borondifluoride complexes is described. The electrochemical and photophysical properties of difluorodioxaborine species were investigated as a function of the nature of electron donor and acceptor groups appended at either terminal positions of the molecular backbone. The emissive character of these dipolar dyes was attributed to an intraligand charge transfer process, leading to fluorescence emission that is strongly dependent on solvent polarity. Quasi-quantitative quenching of fluorescence in high polarity solvents was attributed to photoinduced electron transfer. These dyes were shown to behave as versatile fluorophores. Indeed, they display efficient two-photon excited fluorescence emission leading to high two-photon brightness values. Furthermore, they form nanoparticles in water whose fluorescence emission quantum yield is less than that of the dye in solution, owing to aggregation-induced fluorescence quenching. When cos7 living cells were exposed to these weakly-emitting nanoparticles, one- and two-photon excited fluorescence spectra showed a strong emission within the cytoplasm that originated from the individual molecules. Dye uptake thus involved a disaggregation mechanism at the cell membrane which restored fluorescence emission. This off-on fluorescence switching allows a selective optical monitoring of those molecules that do enter the cell, which offers improved sensitivity and selectivity of detection for bioimaging purposes.
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Affiliation(s)
- Eunsun Kim
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
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29
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Abstract
Electro-optic switching of reflection and refraction is experimentally demonstrated in metasurface liquid crystal cell. Negative metasurface is fabricated by focused-ion-beam milling, and twisted nematic cells are constructed with complementary double-split ring resonator and V-shape slot antenna metasurface. By application of an external voltage, electro-optic switchings are achieved in reflection and refraction. It has a strong implication for applications in spatial light modulation and wavelength division multiplexer/demultiplexer in a near-IR spectral range.
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Affiliation(s)
- Yeon Ui Lee
- Department of Physics, Quantum Metamaterials Research Center, Ewha Womans University, Seoul, 120-750 Korea
| | - Junghee Kim
- Department of Physics, Quantum Metamaterials Research Center, Ewha Womans University, Seoul, 120-750 Korea
| | - Jeong Weon Wu
- Department of Physics, Quantum Metamaterials Research Center, Ewha Womans University, Seoul, 120-750 Korea
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30
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Wu JW, Wang JJ, Chen JB, Huang YL, Wang H, Liu GH, Li LF, Kang M, Wang XG, Cai HH. Resveratrol could reverse the expression of SIRT1 and MMP-1 in vitro. Genet Mol Res 2015; 14:12386-93. [PMID: 26505388 DOI: 10.4238/2015.october.16.5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Intervertebral disc degeneration is the main cause of lumbago disease, in which the extracellular matrix structure and moisture in the nucleus pulposus is lost continuously. In this study, we aimed to detect differential expression of silence mating type information regulation 2 homolog 1 (SIRT1) and matrix metalloproteinase-1 (MMP-1) in human intervertebral disc nucleus pulposus cells and to explore the effects of SIRT1 and MMP-1 on the development of the intervertebral disc degeneration. Intervertebral disc nucleus pulposus specimens from 41 patients who underwent lumbar protrusion resection at HuiZhou Municipal Central Hospital, during the period from October 2011 to December 2013, were studied in comparison with 23 control cases from patients who underwent fractured lumbar resection. In degenerated human intervertebral disc nucleus pulposus cells, the expression of SIRT1 is decreased and MMP-1 is increased compared with that of the control cells. Resveratrol could reverse these effects, thereby increasing the expression of SIRT1 (0.87 ± 0.07 vs 0.54 ± 0.04), Coll2α1 (0.90 ± 0.08 vs 0.38 ± 0.01), and aggrecan (0.69 ± 0.07 vs 0.42 ± 0.05) and decreasing the expression of MMP-1 (0.61 ± 0.03 vs 0.93 ± 0.08). These results suggest that resveratrol could possibly reverse the process of intervertebral disc degeneration and thus could be applied as a potential drug for the disease.
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Affiliation(s)
- J W Wu
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - J J Wang
- Department of Ophthalmology, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - J B Chen
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - Y L Huang
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - H Wang
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - G H Liu
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - L F Li
- Department of Emergency, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - M Kang
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - X G Wang
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
| | - H H Cai
- Department of Spine Surgery, HuiZhou Municipal Central Hospital, HuiZhou, Guangdong, China
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31
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Jeong MY, Chung KS, Wu JW. Optical Properties of Laser Lines and Fluorescent Spectrum in Cholesteric Liquid Crystal Laser. J Nanosci Nanotechnol 2015; 15:7632-7639. [PMID: 26726387 DOI: 10.1166/jnn.2015.11176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We experimentally studied the comprehensive optical properties of the laser lines and fluorescent spectrum generated by a continuous tunable cholesteric liquid crystal (CLC) laser array. We found that the laser lines generated from a CLC with a right-handed circular helix were right-handed circular polarized and laser lines generated from a CLC with a left-handed circular helix were left-handed circular polarized. Inside the photonic band gap, the CLC structure with right-(left-) handed helicity suppressed the fluorescence generated with right (left) circular polarized light, and instead the suppressed right (left) circular polarized light energy moved to the outside of the photonic band gap, so we can say that the fluorescence intensity outside of the photonic band gap is enhanced with right (left) handed circular polarized light. Depending on the position of the photonic band gap, the fluorescence quantum yield value increased by up to ~15%. These enhanced fluorescence intensities at the PBG edge will evolve into lasing at the upper lasing threshold. It is particularly interesting to see that the fluorescence intensity and shape could be controlled by adjusting the external geometrical factor of the photonic band gaps. The lasing threshold of the CLC lasers was in the range of 1.5-5.3 μJ/pulse. For CLC laser device applications, it is necessary and essential to know the optical properties of the generated laser lines and of the fluorescence spectrum.
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32
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Felouat A, D’Aléo A, Charaf-Eddin A, Jacquemin D, Le Guennic B, Kim E, Lee KJ, Woo JH, Ribierre JC, Wu JW, Fages F. Tuning the Direction of Intramolecular Charge Transfer and the Nature of the Fluorescent State in a T-Shaped Molecular Dyad. J Phys Chem A 2015; 119:6283-95. [DOI: 10.1021/acs.jpca.5b03699] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Abdellah Felouat
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Anthony D’Aléo
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
| | - Azzam Charaf-Eddin
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
| | - Denis Jacquemin
- Laboratoire
CEISAM, UMR CNRS 6230, Université de Nantes, 2 Rue de la
Houssinière, BP 92208, 44322 Nantes Cedex 3, France
- Institut Universitaire de France, 103 Boulevard Saint-Michel, 75005 Paris Cedex 05, France
| | - Boris Le Guennic
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Eunsun Kim
- Department
of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
| | - Kwang Jin Lee
- Department
of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
| | - Jae Heun Woo
- Department
of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
| | - Jean-Charles Ribierre
- Department
of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
| | - Jeong Weon Wu
- Department
of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul, South Korea
| | - Frédéric Fages
- Aix Marseille Université, CNRS, CINaM UMR 7325, Campus de Luminy, Case 913, 13288 Marseille, France
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Jeong MY, Chung KS, Wu JW. Temporal, thermal, and light stability of continuously tunable cholesteric liquid crystal laser array. J Nanosci Nanotechnol 2014; 14:8288-8295. [PMID: 25958516 DOI: 10.1166/jnn.2014.9917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Fine-structured polymerized cholesteric liquid crystal (PCLC) wedge laser devices have been realized, with high fine spatial tunability of the lasing wavelength. With resolution less than 0.3 nm in a broad spectral range, more than one hundred laser lines could be obtained in a PCLC cell without extra devices. For practical device application, we studied the stability of the device in detail over time, and in response to strong external light sources, and thermal perturbation. The PCLC wedge cells had good temporal stability for 1 year and showed good stability for strong perturbations, with the lasing wavelength shifting less than 1 nm, while the laser peak intensities decreased by up to 34%, and the high energy band edge of the photonic band gap (PBG) was red shifted 3 nm by temperature perturbation. However, when we consider the entire lasing spectrum for the PCLC cell, the 1-nm wavelength shift may not matter. Although the laser peak intensities were decreased by up to 34% in total for all of the perturbation cases, the remaining 34% laser peak intensity is considerable extent to make use. This good stability of the PCLC laser device is due to the polymerization of the CLC by UV curing. This study will be helpful for practical CLC laser device development.
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Wu JW, Xiao SX, Huo J, An JG, Ren JW. A novel frameshift mutation in the cylindromatosis (CYLD) gene in a Chinese family with multiple familial trichoepithelioma. Arch Dermatol Res 2014; 306:857-60. [PMID: 25234269 DOI: 10.1007/s00403-014-1499-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 08/05/2014] [Accepted: 09/07/2014] [Indexed: 12/16/2022]
Abstract
Multiple familial trichoepithelioma (MFT) (OMIM: 601606) is an autosomal dominantly inherited disorder characterized by numerous, skin-colored papules and nodules with pilar differentiation. Recently, several mutations in the cylindromatosis (CYLD) gene have been reported in MFT. In this study, a mutation analysis of the CYLD was conducted in a Chinese pedigree of typical MFT. Affected individuals were identified through probands from Shanxi Province, China. Lesional skin biopsy of the proband revealed the typical histopathological characteristics of trichoepithelioma. Individuals belonging to five consecutive generations were similarly affected, which indicated an autosomal dominant inheritance pattern. Genomic DNA was extracted from peripheral blood lymphocytes using standard phenol/chloroform extraction method. All the coding exons (4-20) and exon-intron boundaries of the CYLD gene were amplified by polymerase chain reaction (PCR). Direct sequencing of all PCR products amplified from the complete coding regions of the CYLD gene was performed to identify mutations. Sequencing of the CYLD gene was performed in a further 100 unrelated, unaffected control individuals to exclude the possibility of polymorphism. A novel heterozygous frameshift mutation c.1169_1170delCA (p.Thr390Argfs) was identified in exon 10 of the CYLD gene in the affected family members. This mutation was also detected in unaffected family members, but not in the unrelated, healthy individuals who were also analyzed. Our study expands the database on the CYLD gene mutations in MFT and should be useful in providing genetic counseling and prenatal diagnosis for families affected by MFT.
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Affiliation(s)
- J W Wu
- Department of Dermatology, The Second Hospital of Xi'an Jiaotong University, 157 Xi Wu Road, Xi'an, 710004, Shaanxi, People's Republic of China,
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35
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Lee YU, Kim J, Woo JH, Bang LH, Choi EY, Kim ES, Wu JW. Electro-optic switching in phase-discontinuity complementary metasurface twisted nematic cell. Opt Express 2014; 22:20816-20827. [PMID: 25321285 DOI: 10.1364/oe.22.020816] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Electro-optic switching of refraction is experimentally demonstrated in a phase-discontinuity complementary metasurface twisted nematic cell. The phase-discontinuity complementary metasurface is fabricated by focused-ion-beam milling, and a twisted nematic cell is constructed with complementary V-shape slot antenna metasurface. By application of an external voltage, switching is achieved between ordinary refraction and extraordinary refraction satisfying the generalized Snell's law. It has a strong implication for applications in spatial light modulation and wavelength division multiplexer/demultiplexer in a near-IR spectral range.
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Gwon M, Lee YU, Wu JW, Nam D, Cheong H, Kim DW. Polarization-independent light emission enhancement of ZnO/Ag nanograting via surface plasmon polariton excitation and cavity resonance. ACS Appl Mater Interfaces 2014; 6:8602-8605. [PMID: 24850379 DOI: 10.1021/am5014024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study, we observed that the photoluminescence (PL) intensity of ZnO/Ag nanogratings was significantly enhanced compared with that of a planar counterpart under illumination of both transverse magnetic (TM) and transverse electric (TE)-mode light. In the TM mode, angle-resolved reflectance spectra exhibited dispersive dips, indicating cavity resonance as well as grating-coupled surface plasmon polariton (SPP) excitation. In the TE mode, cavity resonance only was allowed, and broad dips appeared in the reflectance spectra. Strong optical field confinement in the ZnO layers, with the help of SPP and cavity modes, facilitated polarization-insensitive PL enhancement. Optical simulation results were in good agreement with the experimental results, supporting the suggested scenario.
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Affiliation(s)
- Minji Gwon
- Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University , Seoul 120-750, Korea
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37
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Lee KJ, Wu JW, Kim K. Enhanced nonlinear optical effects due to the excitation of optical Tamm plasmon polaritons in one-dimensional photonic crystal structures. Opt Express 2013; 21:28817-28823. [PMID: 24514394 DOI: 10.1364/oe.21.028817] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We suggest optimally designed one-dimensional metal/photonic crystal structures for the excitation of optical Tamm plasmon polaritons, which show strongly enhanced electromagnetic field intensities compared to those due to conventional surface plasmon excitations. We assume that the photonic crystal is made of weakly nonlinear optical materials and calculate the reflectance and the electromagnetic field distribution precisely, using the invariant imbedding method generalized to nonlinear media. We find field intensity enhancement factors as large as 3,000 at the metal/photonic crystal interface. We verify that due to this strong enhancement, nonlinear optical effects such as optical bistability can be observed for very small values of the incident wave power. Our results imply that using our structure, very strong surface enhanced Raman scattering signals can be achieved and optical switching devices can be operated in much lower threshold light intensities.
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38
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Wang HW, Duan JM, Zhang P, Cheng YQ, Wu JW, Wang GZ. Microsatellite markers in Paulownia kawakamii (Scrophulariaceae) and cross-amplification in other Paulownia species. Genet Mol Res 2013; 12:3750-4. [PMID: 24085436 DOI: 10.4238/2013.september.19.6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Paulownia kawakamii is a fast-growing timber tree. In this study, 21 primer sets were developed using an enriched genomic library. The genetic diversity was measured in one P. kawakamii population. The number of alleles per locus ranged from 2 to 19. The observed and expected heterozygosities varied from 0.158 to 0.842 (mean = 0.421) and from 0.376 to 0.952 (mean = 0.771), respectively. All 21 loci were also polymorphic in closely related species (P. tomentosa, P. elongata, and P. fortunei). The described markers will be useful in future population genetic studies and molecular breeding of these Paulownia species.
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Affiliation(s)
- H W Wang
- College of Plant Protection, Henan Agricultural University, Zhengzhou, China
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39
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Lee YU, Choi EY, Woo JH, Kim ES, Wu JW. Reflection resonance switching in metamaterial twisted nematics cell. Opt Express 2013; 21:17492-17497. [PMID: 23938619 DOI: 10.1364/oe.21.017492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Electric switching of reflection resonances at near-IR spectral range is experimentally demonstrated in a reflective metamaterial twisted nematic liquid crystal cell. Reflective metamaterial composed of nano-sized double-split ring resonator aperture is fabricated by a focused ion beam milling. Two-fold rotational symmetry of double-split ring resonators allows for two orthogonal polarization-dependent reflection resonances in the reflective metamaterial. With an external voltage of 10V across 12μm cell gap, a full switching is achieved between two reflection resonances. Dynamic measurements show the time constants of switch-on and switch-off are in the order of 100ms and 10ms, respectively.
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Affiliation(s)
- Y U Lee
- Department of Physics, Ewha Womans University, Seoul 120-750, South Korea
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Abstract
We report on the demonstration of liquid organic dye lasers based on 9-(2-ethylhexyl)carbazole (EHCz), so-called liquid carbazole, doped with green- and red-emitting laser dyes. Both waveguide and Fabry-Perot type microcavity fluidic organic dye lasers were prepared by capillary action under solvent-free conditions. Cascade Förster-type energy transfer processes from liquid carbazole to laser dyes were employed to achieve color-variable amplified spontaneous emission and lasing. Overall, this study provides the first step towards the development of solvent-free fluidic organic semiconducting lasers and demonstrates a new kind of optoelectronic applications for liquid organic semiconductors.
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Affiliation(s)
- Eun Young Choi
- Department of Physics, CNRS-Ewha International Research Center, Ewha Womans University, Seoul 120-750, South Korea
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Kim J, Lee YU, Kang B, Woo JH, Choi EY, Kim ES, Gwon M, Kim DW, Wu JW. Fabrication of polarization-dependent reflective metamaterial by focused ion beam milling. Nanotechnology 2013; 24:015306. [PMID: 23220863 DOI: 10.1088/0957-4484/24/1/015306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
By focused ion beam milling, we fabricated near-IR reflective metamaterials consisting of nano-aperture arrays. Optimum parameters of ion beam current and accelerating voltage in the fabrication process are obtained. Nano-apertures constituting reflective metamaterial are successfully milled, and possess a reflective resonance in the near-IR spectral range. With a double-split-ring resonator structure for the nano-aperture, the intensity reflection at resonance is rendered polarization dependent. It is found that the point group symmetry of the nano-aperture array determines the amount of anisotropy in the intensity reflection. Finite-difference time-domain simulation was adopted to identify details of nano-aperture metastructures transferred from nano-aperture patterns by the focused ion beam milling.
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Affiliation(s)
- J Kim
- Department of Physics, Ewha Womans University, CNRS-Ewha International Research Center, Seoul 120-750, Korea
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Woo JH, Choi E, Kang B, Kim ES, Kim J, Lee YU, Hong TY, Kim JH, Lee I, Lee YH, Wu JW. Anisotropic change in THz resonance of planar metamaterials by liquid crystal and carbon nanotube. Opt Express 2012; 20:15440-15451. [PMID: 22772240 DOI: 10.1364/oe.20.015440] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
THz metamaterials are employed to examine changes in the meta-resonances when two anisotropic organic materials, liquid crystal and carbon nanotubes, are placed on top of metamaterials. In both anisotropic double split-ring resonators and isotropic four-fold symmetric split-ring resonators, anisotropic interactions between the electric field and organic materials are enhanced in the vicinity of meta-resonances. In liquid crystal, meta-resonance frequency shift is observed with the magneto-optical coupling giving rise to the largest anisotropic shift. In carbon nanotube, meta-resonance absorptions, parallel and perpendicular to nanotube direction, experience different amount of broadening of Lorentzian oscillator of meta-resonance. Investigation reported here opens the application of metamaterials as a sensor for anisotropic materials.
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Affiliation(s)
- J H Woo
- Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, South Korea
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Jeong MY, Wu JW. Continuous spatial tuning of laser emissions in a full visible spectral range. Int J Mol Sci 2011; 12:2007-18. [PMID: 21673936 PMCID: PMC3111647 DOI: 10.3390/ijms12032007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 03/04/2011] [Accepted: 03/18/2011] [Indexed: 11/16/2022] Open
Abstract
In order to achieve a continuous tuning of laser emission, the authors designed and fabricated three types of cholesteric liquid crystal cells with pitch gradient, a wedge cell with positive slope, a wedge cell with negative slope, and a parallel cell. The length of the cholesteric liquid crystal pitch could be elongated up to 10 nm, allowing the lasing behavior of continuous or discontinuous spatial tuning determined by the boundary conditions of the cholesteric liquid crystal cell. In the wedge cell with positive slope, the authors demonstrated a continuous spatial laser tuning in the near full visible spectral range, with a tuning resolution less than 1 nm by pumping with only a single 355 nm laser beam. This continuous tuning behavior is due to the fact that the concentration of pitch gradient matches the fixed helical pitch determined by the cell thickness. This characteristic continuous spatial laser tuning could be confirmed again by pumping with a 532 nm laser beam, over 90 nm in the visible spectral range. The scheme of the spatial laser tuning in the wedge cell bearing a pitch gradient enabled a route to designing small-sized optical devices that allow for a wide tunability of single-mode laser emissions.
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Affiliation(s)
- Mi-Yun Jeong
- Department of Physics and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Korea
- Authors to whom correspondence should be addressed; E-Mails: (M.Y.J.); (J.W.W.)
| | - Jeong Weon Wu
- Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, Korea
- Authors to whom correspondence should be addressed; E-Mails: (M.Y.J.); (J.W.W.)
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Woo JH, Kim ES, Choi E, Kang B, Lee HH, Kim J, Lee YU, Hong TY, Kim JH, Wu JW. Cryogenic temperature measurement of THz meta-resonance in symmetric metamaterial superlattice. Opt Express 2011; 19:4384-4392. [PMID: 21369268 DOI: 10.1364/oe.19.004384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A symmetric metamaterial superlattice is introduced accommodating a high Q-factor trapped mode. THz time-domain spectroscopy is employed to measure the transmission spectra, identifying the excitation of trapped and open-modes in the meta-resonances. A finite-difference-time- domain calculation showed that the trapped mode excitation is from the cancelation of current densities among the nearest-neighboring meta-particles. A cryogenic temperature THz measurement is carried out to examine the temperature dependence of resonance characteristics of meta-resonances. At low temperatures, the temperature-independent radiative damping is dominant for the open-mode, while the Q-factor of the trapped mode is determined by the temperature-dependent phonon scattering and temperature-independent defect scattering with the radiative damping significantly suppressed. When compared with the room temperature measurement, a 16% increase in Q-factor is observed for the trapped mode, while a 7% increase for the open-mode at the cryogenic temperature.
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Affiliation(s)
- J H Woo
- Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul, South Korea
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45
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Jeong MY, Wu JW. Continuous spatial tuning of laser emissions with tuning resolution less than 1 nm in a wedge cell
of dye-doped cholesteric liquid crystals. Opt Express 2010; 18:24221-24228. [PMID: 21164768 DOI: 10.1364/oe.18.024221] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report the design and fabrication of a wedge structured CLC film incorporating a spatial gradient of a chiral dopant concentration. A continuous spatial laser tuning in the broad visible spectral range with tuning resolution less than 1 nm is demonstrated, which renders a CLC-based micron-sized laser an important continuously tunable laser device.
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Affiliation(s)
- Mi-Yun Jeong
- Department of Physics and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Korea.
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46
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Kang B, Woo JH, Choi E, Lee HH, Kim ES, Kim J, Hwang TJ, Park YS, Kim DH, Wu JW. Optical switching of near infrared light transmission in metamaterial-liquid crystal cell structure. Opt Express 2010; 18:16492-16498. [PMID: 20721037 DOI: 10.1364/oe.18.016492] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A metamaterial-liquid crystal cell structure is fabricated with the metamaterial as one of the liquid crystal alignment layers. Nano-sized double-split ring resonator in the metamaterial accommodates two distinct resonances in the near infrared regime. By adopting an azo-nematic liquid crystal in a twisted nematic liquid crystal cell structure, a photo-isomerization process is utilized to achieve an optical switching of light transmissions between two resonances. A single device of the metamaterial-liquid crystal cell structure has a potential application in the photonic switching in optical fiber telecommunications.
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Affiliation(s)
- Boyoung Kang
- 1Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, Korea
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47
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Choi H, Kim J, Nishimura S, Toyooka T, Araoka F, Ishikawa K, Wu JW, Takezoe H. Broadband cavity-mode lasing from dye-doped nematic liquid crystals sandwiched by broadband cholesteric liquid crystal bragg reflectors. Adv Mater 2010; 22:2680-2684. [PMID: 20432476 DOI: 10.1002/adma.200904110] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Affiliation(s)
- Hyunhee Choi
- Department of Organic and Polymeric Materials Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan
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48
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Kang B, Choi E, Lee HH, Kim ES, Woo JH, Kim J, Hong TY, Kim JH, Wu JW. Polarization angle control of coherent coupling in metamaterial superlattice for closed mode excitation. Opt Express 2010; 18:11552-11561. [PMID: 20589016 DOI: 10.1364/oe.18.011552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A superlattice structure of planar metamaterial is fabricated, where the orientation of double-split ring resonators is altered in a periodic way. A time-domain terahertz transmission spectrum shows an enhanced Q-factor resonance appears when a closed mode is selectively excited by angular tuning of polarization direction. The polarization-angle selective resonance in metamaterial superlattice has a potential application in the selective field enhancement for spectroscopy.
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Affiliation(s)
- Boyoung Kang
- 1Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul 120-750, Korea
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49
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Wu JW, Xiao SX. A recurrent keratin 14 mutation in Dowling-Meara epidermolysis bullosa simplex in a Chinese family. J Eur Acad Dermatol Venereol 2009; 23:484-6. [DOI: 10.1111/j.1468-3083.2008.02930.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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50
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Wu JW, Xiao SX, Liu Y, Yu B, Bai ZL, Zhou SN, Li XL. Identification of two recurrent mutations in keratin genes in three cases with pachyonychia congenita. J Eur Acad Dermatol Venereol 2008; 23:174-6. [PMID: 18429985 DOI: 10.1111/j.1468-3083.2008.02752.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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