1
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Lai S, Liang X, Zeng Q. Recent Progress in Synthesis and Application of Chiral Organoselenium Compounds. Chemistry 2024; 30:e202304067. [PMID: 38078625 DOI: 10.1002/chem.202304067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Indexed: 01/12/2024]
Abstract
Chiral organoselenium compounds have shown an important role as intermediates in many areas, such as drug discovery, organic catalysis, and nanomaterials. A lot of different methods have been developed to synthesize chiral compounds which contain selenium, because they have interesting properties and can be used in real life. Over the last few decades, a lot of progress has been made in synthesizing chiral organoselenium compounds. This work gives an overview of the progress made in creating new ways to synthesize chiral organoselenium compounds by categorizing them into groups based on the reactions they undergo. In addition, the use of chiral organoselenium compounds is also discussed.
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Affiliation(s)
- Shuyan Lai
- College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China
| | - Xiayu Liang
- College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China
| | - Qingle Zeng
- College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China
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2
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Huang W, De-Eknamkul C, Ren Y, Cubukcu E. Directing valley-polarized emission of 3 L WS 2 by photonic crystal with directional circular dichroism. OPTICS EXPRESS 2024; 32:6076-6084. [PMID: 38439318 PMCID: PMC11018336 DOI: 10.1364/oe.510027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 01/10/2024] [Accepted: 01/19/2024] [Indexed: 03/06/2024]
Abstract
The valley degree of freedom that results from broken inversion symmetry in two-dimensional (2D) transition-metal dichalcogenides (TMDCs) has sparked a lot of interest due to its huge potential in information processing. In this experimental work, to optically address the valley-polarized emission from three-layer (3 L) thick WS2 at room temperature, we employ a SiN photonic crystal slab that has two sets of holes in a square lattice that supports directional circular dichroism engendered by delocalized guided mode resonances. By perturbatively breaking the inversion symmetry of the photonic crystal slab, we can simultaneously manipulate s and p components of the radiating field so that these resonances correspond to circularly polarized emission. The emission of excitons from distinct valleys is coupled into different radiative channels and hence separated in the farfield. This directional exciton emission from selective valleys provides a potential route for valley-polarized light emitters, which lays the groundwork for future valleytronic devices.
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Affiliation(s)
- Wenzhuo Huang
- Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093-0407, USA
| | - Chawina De-Eknamkul
- Department of NanoEngineering, University of California, San Diego, La Jolla, California 92093-0448, USA
| | - Yundong Ren
- Department of NanoEngineering, University of California, San Diego, La Jolla, California 92093-0448, USA
| | - Ertugrul Cubukcu
- Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093-0407, USA
- Department of NanoEngineering, University of California, San Diego, La Jolla, California 92093-0448, USA
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3
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Wang Y, Li Z, Peng Y, Lan X, Dong J, Gao W, Han Q, Qi J, Zhang Z. Enhancement and Sensing Application of Ultra-Narrowband Circular Dichroism in the Chiral Nanostructures Based on Monolayer MoS 2 and a Distributed Bragg Reflector. ACS APPLIED MATERIALS & INTERFACES 2023; 15:1925-1933. [PMID: 36538828 DOI: 10.1021/acsami.2c20203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Narrowband circular dichroism (CD) has aroused wide concerns in high-sensitivity detections of chiral molecular and chiral catalysis. Nevertheless, the dynamical adjustment of ultra-narrowband (UNB) CD signals is hard to achieve. In this work, single-layer molybdenum disulfide (MoS2), vanadium dioxide (VO2), and a distributed Bragg reflector (DBR) are introduced into X-shaped chiral nanostructures (XCNs) for overcoming the above challenge. The simulation results show that XCNs can generate four strong UNB CD signals in the near-infrared band, and XCNs/MoS2 can further enhance the UNB CD signals. The full width at half-minimum of UNB CD signals can reach 0.14 nm. The electric field distributions of XCNs/MoS2 show that the four CD signals originate from the coupling between the guided mode resonances along the x and y axes in the VO2 layer and the Tamm plasmon polaritons along the x and y axes in the DBR layer. Four UNB CD peaks can be actively tuned by varying the structural parameters, the number of MoS2 layers, and the environmental temperature. The FOM of XCNs/MoS2 can reach 1487 by changing the refractive index of the DRB layers. These findings contribute to the design of UNB chiral devices and provide new possibilities for environmental monitoring and ultrasensitive detection of chiral molecules.
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Affiliation(s)
- Yongkai Wang
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Zhiduo Li
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Yu Peng
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Xiang Lan
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Jun Dong
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Wei Gao
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Qingyan Han
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Jianxia Qi
- School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
| | - Zhongyue Zhang
- School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
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4
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Lin HT, Hsu YY, Cheng PJ, Wang WT, Chang SW, Shih MH. In situ tunable circular dichroism of flexible chiral metasurfaces composed of plasmonic nanorod trimers. NANOSCALE ADVANCES 2022; 4:2428-2434. [PMID: 36134130 PMCID: PMC9418018 DOI: 10.1039/d2na00144f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 03/13/2022] [Indexed: 06/16/2023]
Abstract
The circularly polarized light source is one of the keys to chiral photonic circuits and systems. However, it is difficult to integrate conventional light-emitting devices with circular polarization converters directly into compact chip-scale photonic systems partly because of their bulky structures. In this study, in situ optical chirality tunable nanorod trimer metasurfaces consisting of two types of nanorod dimers are demonstrated and integrated with a flexible polydimethylsiloxane (PDMS) substrate. The optical chirality variations originating from the tunable asymmetricity of nanorod trimers under different stretching scenarios are evaluated. Through the processes, the gap distances between nanorods are varied, and the degree of circular polarization of the transmitted wave is controlled through the manipulation of localized surface plasmon resonance (LSPR) coupling. The results reveal the circular dichroism tunability and durability of fabricated chiral metasurfaces which can be important elements for chip-scale flexible optoelectronic integrated circuits for sensing, display and communication applications.
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Affiliation(s)
- Hsiang-Ting Lin
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
| | - Yao-Yu Hsu
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
- Department of Photonics and Institute of Electro-Optical Engineering, National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
| | - Pi-Ju Cheng
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
| | - Wei-Ting Wang
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
| | - Shu-Wei Chang
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
- Department of Photonics and Institute of Electro-Optical Engineering, National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
| | - Min-Hsiung Shih
- Research Center for Applied Sciences, Academia Sinica Taipei 11529 Taiwan
- Department of Photonics and Institute of Electro-Optical Engineering, National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
- Department of Photonics, National Sun Yat-sen University Kaohsiung 80424 Taiwan
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Li J, Liu J, Guo Z, Chang Z, Guo Y. Engineering Plasmonic Environments for 2D Materials and 2D-Based Photodetectors. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27092807. [PMID: 35566157 PMCID: PMC9100532 DOI: 10.3390/molecules27092807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 04/24/2022] [Accepted: 04/26/2022] [Indexed: 11/28/2022]
Abstract
Two-dimensional layered materials are considered ideal platforms to study novel small-scale optoelectronic devices due to their unique electronic structures and fantastic physical properties. However, it is urgent to further improve the light–matter interaction in these materials because their light absorption efficiency is limited by the atomically thin thickness. One of the promising approaches is to engineer the plasmonic environment around 2D materials for modulating light–matter interaction in 2D materials. This method greatly benefits from the advances in the development of nanofabrication and out-plane van der Waals interaction of 2D materials. In this paper, we review a series of recent works on 2D materials integrated with plasmonic environments, including the plasmonic-enhanced photoluminescence quantum yield, strong coupling between plasmons and excitons, nonlinear optics in plasmonic nanocavities, manipulation of chiral optical signals in hybrid nanostructures, and the improvement of the performance of optoelectronic devices based on composite systems.
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Affiliation(s)
- Jianmei Li
- State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China; (J.L.); (Z.G.); (Z.C.)
- Correspondence: (J.L.); (Y.G.)
| | - Jingyi Liu
- State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China; (J.L.); (Z.G.); (Z.C.)
| | - Zirui Guo
- State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China; (J.L.); (Z.G.); (Z.C.)
| | - Zeyu Chang
- State Key Laboratory of Metastable Materials Science and Technology & Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China; (J.L.); (Z.G.); (Z.C.)
| | - Yang Guo
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100190, China
- Correspondence: (J.L.); (Y.G.)
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James Singh K, Ciou HH, Chang YH, Lin YS, Lin HT, Tsai PC, Lin SY, Shih MH, Kuo HC. Optical Mode Tuning of Monolayer Tungsten Diselenide (WSe 2) by Integrating with One-Dimensional Photonic Crystal through Exciton-Photon Coupling. NANOMATERIALS 2022; 12:nano12030425. [PMID: 35159765 PMCID: PMC8839532 DOI: 10.3390/nano12030425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 02/04/2023]
Abstract
Two-dimensional materials, such as transition metal dichalogenides (TMDs), are emerging materials for optoelectronic applications due to their exceptional light-matter interaction characteristics. At room temperature, the coupling of excitons in monolayer TMDs with light opens up promising possibilities for realistic electronics. Controlling light-matter interactions could open up new possibilities for a variety of applications, and it could become a primary focus for mainstream nanophotonics. In this paper, we show how coupling can be achieved between excitons in the tungsten diselenide (WSe2) monolayer with band-edge resonance of one-dimensional (1-D) photonic crystal at room temperature. We achieved a Rabi splitting of 25.0 meV for the coupled system, indicating that the excitons in WSe2 and photons in 1-D photonic crystal were coupled successfully. In addition to this, controlling circularly polarized (CP) states of light is also important for the development of various applications in displays, quantum communications, polarization-tunable photon source, etc. TMDs are excellent chiroptical materials for CP photon emitters because of their intrinsic circular polarized light emissions. In this paper, we also demonstrate that integration between the TMDs and photonic crystal could help to manipulate the circular dichroism and hence the CP light emissions by enhancing the light-mater interaction. The degree of polarization of WSe2 was significantly enhanced through the coupling between excitons in WSe2 and the PhC resonant cavity mode. This coupled system could be used as a platform for manipulating polarized light states, which might be useful in optical information technology, chip-scale biosensing and various opto-valleytronic devices based on 2-D materials.
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Affiliation(s)
- Konthoujam James Singh
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
| | - Hao-Hsuan Ciou
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Ya-Hui Chang
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Yen-Shou Lin
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Hsiang-Ting Lin
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Po-Cheng Tsai
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Shih-Yen Lin
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
| | - Min-Hsiung Shih
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
- Department of Photonics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
- Correspondence: (M.-H.S.); (H.-C.K.); Tel.: +886-3-5712121 (H.-C.K.)
| | - Hao-Chung Kuo
- Department of Photonics, Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan; (K.J.S.); (H.-H.C.); (Y.-H.C.); (Y.-S.L.)
- Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan; (H.-T.L.); (P.-C.T.); (S.-Y.L.)
- Correspondence: (M.-H.S.); (H.-C.K.); Tel.: +886-3-5712121 (H.-C.K.)
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Lin WH, Wu PC, Akbari H, Rossman GR, Yeh NC, Atwater HA. Electrically Tunable and Dramatically Enhanced Valley-Polarized Emission of Monolayer WS 2 at Room Temperature with Plasmonic Archimedes Spiral Nanostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2104863. [PMID: 34725874 DOI: 10.1002/adma.202104863] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 10/03/2021] [Indexed: 05/27/2023]
Abstract
Monolayer transition metal dichalcogenides (TMDs) have intrinsic valley degrees of freedom, making them appealing for exploiting valleytronic applications in information storage and processing. WS2 monolayer possesses two inequivalent valleys in the Brillouin zone, each valley coupling selectively with a circular polarization of light. The degree of valley polarization (DVP) under the excitation of circularly polarized light (CPL) is a parameter that determines the purity of valley polarized photoluminescence (PL) of monolayer WS2 . Here efficient tailoring of valley-polarized PL from monolayer WS2 at room temperature (RT) through surface plasmon-exciton interactions with plasmonic Archimedes spiral (PAS) nanostructures is reported. The DVP of WS2 at RT can be enhanced from <5% to 40% and 50% by using 2 turns (2T) and 4 turns (4T) of PAS, respectively. Further enhancement and control of excitonic valley polarization is demonstrated by electrostatically doping monolayer WS2 . For CPL on WS2 -2TPAS heterostructures, the 40% valley polarization is enhanced to 70% by modulating the carrier doping via a backgate, which may be attributed to the screening of momentum-dependent long-range electron-hole exchange interactions. The manifestation of electrically tunable valley-polarized emission from WS2 -PAS heterostructures presents a new strategy toward harnessing valley excitons for application in ultrathin valleytronic devices.
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Affiliation(s)
- Wei-Hsiang Lin
- Department of Applied Physics, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Pin Chieh Wu
- Department of Photonics, National Cheng Kung University, Tainan, 70101, Taiwan
| | - Hamidreza Akbari
- Department of Applied Physics, California Institute of Technology, Pasadena, CA, 91125, USA
| | - George R Rossman
- Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Nai-Chang Yeh
- Department of Physics, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Harry A Atwater
- Department of Applied Physics, California Institute of Technology, Pasadena, CA, 91125, USA
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8
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Li Y, Bai Y, Zhang Z, Abudukelimu A, Ren Y, Muhammad I, Li Q, Zhang Z. Enhanced circular dichroism of plasmonic chiral system due to indirect coupling of two unaligned nanorods with metal film. APPLIED OPTICS 2021; 60:6742-6747. [PMID: 34613151 DOI: 10.1364/ao.432156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
Circular dichroism (CD) demonstrates broad application prospects in enantioselective catalysis, chiral separation, and ultrasensitive detection. Increasing the CD intensity of easily fabricated plasmonic nanostructures will promote the application of these artificial nanostructures. A chiral plasmonic system that consists of two unaligned nanorods and a metal film is proposed in this study to achieve a large CD effect. Indirect coupling of a nanorod-film-nanorod in the proposed chiral plasmonic system generates a larger CD intensity compared to the direct coupling of a nanorod-nanorod. In addition, the effects of structural parameters on the CD effect of the proposed system are numerically investigated. Results showed that the indirect coupling is strongly dependent on the separation between the nanorod and the metal film. The results of this study can provide an effective strategy to enhance the CD effect of plasmonic chiral systems.
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Liu G, Zheng X, Liu H, Yin J, Ke C, Yang W, Wu Y, Wu Z, Li X, Zhang C, Kang J. Enhancement of Room-Temperature Photoluminescence and Valley Polarization of Monolayer and Bilayer WS 2 via Chiral Plasmonic Coupling. ACS APPLIED MATERIALS & INTERFACES 2021; 13:35097-35104. [PMID: 34259493 DOI: 10.1021/acsami.1c06622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Transition-metal dichalcogenides with intrinsic spin-valley degree of freedom have enabled great potentials for valleytronic and optoelectronic applications. However, the degree of valley polarization is usually low under nonresonant excitation at room temperature due to the phonon-assisted intervalley scattering. Here, achiral and chiral Au arrays are designed to enhance the optical response and valley polarization in monolayer and bilayer WS2. A considerable band edge emission with 7 times increment is realized under the resonant coupling with Au dimer-prism arrays. Valley polarization enhancement is quantitatively predicted by the inherent mechanisms from elevated electromagnetic field intensity and radiation efficiency and further realized in polarized photoluminescence. A tunable valley polarization up to 30.0% is achieved in bilayer WS2 under a nonresonant excitation at room temperature. All of these results provide a promising route toward the development of room-temperature valley-dependent optoelectronic devices.
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Affiliation(s)
- Gaohong Liu
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Xuanli Zheng
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Haiyang Liu
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Jun Yin
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Congming Ke
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Weihuang Yang
- Key Laboratory of RF Circuits and System of Ministry of Education, Hangzhou Dianzi University, Hangzhou 310018, P. R. China
| | - Yaping Wu
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Zhiming Wu
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Xu Li
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Chunmiao Zhang
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
| | - Junyong Kang
- Department of Physics, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Xiamen University, Xiamen 361005, P. R. China
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10
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Li S, Wang H, Wang J, Chen H, Shao L. Control of light-valley interactions in 2D transition metal dichalcogenides with nanophotonic structures. NANOSCALE 2021; 13:6357-6372. [PMID: 33885520 DOI: 10.1039/d0nr08000d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Electronic valley in two-dimensional transition-metal dichalcogenides (2D TMDCs) offers a new degree of freedom for information storage and processing. The valley pseudospin can be optically encoded by photons with specific helicity, enabling the construction of electronic information devices with both high performance and low power consumption. Robust detection, manipulation and transport of the valley pseudospins at room temperature are still challenging because of the short lifetime of valley-polarized carriers and excitons. Integrating 2D TMDCs with nanophotonic objects such as plasmonic nanostructures provides a competitive solution to address the challenge. The research in this field is of practical interest and can also present rich physics of light-matter interactions. In this minireview, recent progress on using nanophotonic strategies to enhance the valley polarization degree, especially at room temperature, is highlighted. Open questions, major challenges, and interesting future developments in manipulating the valley information in 2D semiconductors with the help of nanophotonic structures will also be discussed.
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Affiliation(s)
- Shasha Li
- Beijing Computational Science Research Center, Beijing 100193, China.
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11
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Wu Z, Li J, Zhang X, Redwing JM, Zheng Y. Room-Temperature Active Modulation of Valley Dynamics in a Monolayer Semiconductor through Chiral Purcell Effects. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1904132. [PMID: 31621963 DOI: 10.1002/adma.201904132] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 09/14/2019] [Indexed: 06/10/2023]
Abstract
Spin-dependent contrasting phenomena at K and K' valleys in monolayer semiconductors have led to addressable valley degree of freedom, which is the cornerstone for emerging valleytronic applications in information storage and processing. Tunable and active modulation of valley dynamics in a monolayer WSe2 is demonstrated at room temperature through controllable chiral Purcell effects in plasmonic chiral metamaterials. The strong spin-dependent modulation on the spontaneous decay of valley excitons leads to tunable handedness and spectral shift of valley-polarized emission, which is analyzed and predicted by an advanced theoretical model and further confirmed by experimental measurements. Moreover, large active spectral tuning (≈24 nm) and reversible ON/OFF switching of circular polarization of emission are achieved by the solvent-controllable thickness of the dielectric spacer in the metamaterials. With the on-demand and active tunability in valley-polarized emission, chiral Purcell effects can provide new strategies to harness valley excitons for applications in ultrathin valleytronic devices.
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Affiliation(s)
- Zilong Wu
- Walker Department of Mechanical Engineering, Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Jingang Li
- Walker Department of Mechanical Engineering, Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Xiaotian Zhang
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Joan M Redwing
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, 16802, USA
- 2D Crystal Consortium, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA
| | - Yuebing Zheng
- Walker Department of Mechanical Engineering, Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA
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12
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Forbes KA, Bradshaw DS, Andrews DL. Influence of chirality on fluorescence and resonance energy transfer. J Chem Phys 2019; 151:034305. [PMID: 31325950 DOI: 10.1063/1.5109844] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Electronically excited molecules frequently exhibit two distinctive decay mechanisms that rapidly generate optical emission: one is direct fluorescence and the other is energy transfer to a neighboring component. In the latter, the process leading to the ensuing "indirect" fluorescence is known as FRET, or fluorescence resonance energy transfer. For chiral molecules, both fluorescence and FRET exhibit discriminatory behavior with respect to optical and material handedness. While chiral effects such as circular dichroism are well known, as too is chiral discrimination for FRET in isolation, this article presents a study on a stepwise mechanism that involves both. Chirally sensitive processes follow excitation through the absorption of circularly polarized light and are manifest in either direct or indirect fluorescence. Following recent studies setting down the symmetry principles, this analysis provides a rigorous, quantum outlook that complements and expands on these works. Circumventing expressions that contain complicated tensorial components, our results are amenable for determining representative numerical values for the relative importance of the various coupling processes. We discover that circular dichroism exerts a major influence on both fluorescence and FRET, and resolving the engagement of chirality in each component reveals the distinct roles of absorption and emission by, and between, donor and acceptor pairs. It emerges that chiral discrimination in the FRET stage is not, as might have been expected, the main arbiter in the stepwise mechanism. In the concluding discussion on various concepts, attention is focused on the validity of helicity transfer in FRET.
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Affiliation(s)
- Kayn A Forbes
- School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - David S Bradshaw
- School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
| | - David L Andrews
- School of Chemistry, University of East Anglia, Norwich NR4 7TJ, United Kingdom
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Ao X, Xu X, Dong J, He S. Unidirectional Enhanced Emission from 2D Monolayer Suspended by Dielectric Pillar Array. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34817-34821. [PMID: 30281276 DOI: 10.1021/acsami.8b12701] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Monolayers of transition metal dichalcogenides show great promise for optoelectronic devices as atomically thin semiconductors. Although dielectric or metal nanostructures have been extensively studied for tailoring and enhancing emission from monolayers, their applications are limited because of the mode concentrating inside the dielectric or the high optical losses in metals, together with the low quantum yield in monolayers. Here, we demonstrate that a metal-backed dielectric pillar array can suspend monolayers to increase the radiative recombination, and simultaneously, create strongly confined band-edge modes on surface directly accessible to monolayers. We observe unidirectional enhanced emission from WSe2 monolayers on polymer pillar array.
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Affiliation(s)
- Xianyu Ao
- Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Xinan Xu
- Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Jinwu Dong
- Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Sailing He
- Centre for Optical and Electromagnetic Research, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Engineering Research Center for Optical Instruments, Centre for Optical and Electromagnetic Research, JORCEP , Zhejiang University , Hangzhou 310058 , China
- School of Electrical Engineering , KTH Royal Institute of Technology , SE-100 44 Stockholm , Sweden
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