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Chang Y, Yao J, Wu X, Wu D, Liu X. Strong and weak couplings in molecular vibration-plasmon hybrid structures. OPTICS EXPRESS 2019; 27:1479-1487. [PMID: 30696212 DOI: 10.1364/oe.27.001479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Molecular vibration-plasmon couplings in a hybrid structure, which are composed of a silver grating filled with polymethyl methacrylate (PMMA) molecules (SG-PMMA), have been investigated theoretically. It is found that the interaction between the vibrational transitions and plasmons can transform from weak coupling into strong coupling by reducing the distance between the elements. When the space between grating elements is large, the localized surface plasmon resonance (LSP) of the silver elements greatly enhances the absorption of the PMMA molecules. As the gap between elements becomes small, the plasmonic nanocavity (NC) mode emerges and couples strongly with the molecular vibrational mode of PMMA. The strong coupling results in two new hybridized modes and the Rabi splitting energy is about 15 meV. Our work provides an effective way to alter the coupling strength of the molecular vibration-plasmon hybrid system and may be beneficial to the further biochemical and biophysical applications.
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Ho YL, Abasaki M, Yin S, Liu X, Delaunay JJ. Fluid-controlled tunable infrared filtering in hollow plasmonic nanofin cavities. NANOTECHNOLOGY 2016; 27:425202. [PMID: 27623320 DOI: 10.1088/0957-4484/27/42/425202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Subwavelength structures sustaining surface plasmons have been employed in numerous fields due to their small size and ability to manipulate light beyond the diffraction limit. Light filtering using small-size plasmonic devices is a promising means of portable spectroscopy for purposes such as on-site chemical analyses. However, most plasmonic filters can only tune the resonance band by modifying the geometry of the structure or changing the incident light angle. Here, we present a plasmonic nanofin-cavity structure having a narrow band with its resonance wavelength controlled by varying the fluid in the hollow cavities of the filter. Control of the narrow-band resonance is realized over a wide range because of the coupling between the stationary surface plasmons generated from the nanofin-cavity mode and the propagating surface plasmons. The hollow cavity design enables fluid to be easily injected and removed, so that the filtered band can be controlled without the need for a complex and bulky structure or application of an external voltage.
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Affiliation(s)
- Ya-Lun Ho
- School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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Jacassi A, Bozzola A, Zilio P, Tantussi F, De Angelis F. 3D coaxial out-of-plane metallic antennas for filtering and multi-spectral imaging in the infrared range. Sci Rep 2016; 6:28738. [PMID: 27345517 PMCID: PMC4921826 DOI: 10.1038/srep28738] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 06/07/2016] [Indexed: 11/09/2022] Open
Abstract
We fabricated and investigated a new configuration of 3D coaxial metallic antennas working in the infrared which combines the strong lateral light scattering of vertical plasmonic structures with the selective spectral transmission of 2D arrays of coaxial apertures. The coaxial structures are fabricated with a top-down method based on a template of hollow 3D antennas. Each antenna has a multilayer radial structure consisting of dielectric and metallic materials not achievable in a 2D configuration. A planar metallic layer is inserted normally to the antennas. The outer dielectric shell of the antenna defines a nanometric gap between the horizontal plane and the vertical walls. Thanks to this aperture, light can tunnel to the other side of the plane, and be transmitted to the far field in a set of resonances. These are investigated with finite-elements electromagnetic calculations and with Fourier-transform infrared spectroscopy measurements. The spectral position of the resonances can be tuned by changing the lattice period and/or the antenna length. Thanks to the strong scattering provided by the 3D geometry, the transmission peaks possess a high signal-to-noise ratio even when the illuminated area is less than 2 × 2 times the operation wavelength. This opens new possibilities for multispectral imaging in the IR with wavelength-scale spatial resolution.
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Affiliation(s)
- Andrea Jacassi
- Istituto Italiano di Tecnologia-via Morego, 30, I-16163 Genova, Italy.,Università degli Studi di Genova, via Balbi, 5, I-16126, Genova, Italy
| | - Angelo Bozzola
- Istituto Italiano di Tecnologia-via Morego, 30, I-16163 Genova, Italy
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Lee KCJ, Chen YH, Lin HY, Cheng CC, Chen PY, Wu TY, Shih MH, Wei KH, Li LJ, Chang CW. Plasmonic Gold Nanorods Coverage Influence on Enhancement of the Photoluminescence of Two-Dimensional MoS2 Monolayer. Sci Rep 2015; 5:16374. [PMID: 26576041 PMCID: PMC4647184 DOI: 10.1038/srep16374] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2015] [Accepted: 10/13/2015] [Indexed: 01/24/2023] Open
Abstract
The 2-D transition metal dichalcogenide (TMD) semiconductors, has received great attention due to its excellent optical and electronic properties and potential applications in field-effect transistors, light emitting and sensing devices. Recently surface plasmon enhanced photoluminescence (PL) of the weak 2-D TMD atomic layers was developed to realize the potential optoelectronic devices. However, we noticed that the enhancement would not increase monotonically with increasing of metal plasmonic objects and the emission drop after the certain coverage. This study presents the optimized PL enhancement of a monolayer MoS2 in the presence of gold (Au) nanorods. A localized surface plasmon wave of Au nanorods that generated around the monolayer MoS2 can provide resonance wavelength overlapping with that of the MoS2 gain spectrum. These spatial and spectral overlapping between the localized surface plasmon polariton waves and that from MoS2 emission drastically enhanced the light emission from the MoS2 monolayer. We gave a simple model and physical interpretations to explain the phenomena. The plasmonic Au nanostructures approach provides a valuable avenue to enhancing the emitting efficiency of the 2-D nano-materials and their devices for the future optoelectronic devices and systems.
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Affiliation(s)
- Kevin C J Lee
- Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan
| | - Yi-Huan Chen
- Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan
| | - Hsiang-Yu Lin
- Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.,Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan
| | - Chia-Chin Cheng
- Department of Materials Science &Engineering, National Chiao Tung University Hsinchu, 30010, Taiwan
| | - Pei-Ying Chen
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University (NTHU), Hsinchu, 30013, Taiwan
| | - Ting-Yi Wu
- Research Center of Applied Sciences (RCAS), Academia Sinica, Taipei, 11529, Taiwan.,Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan
| | - Min-Hsiung Shih
- Department of Photonics, National Chiao Tung University (NCTU), Hsinchu, 30010, Taiwan.,Department of Photonics, National Sun Yat-sen University, Kaohsiung, 804, Taiwan
| | - Kung-Hwa Wei
- Department of Materials Science &Engineering, National Chiao Tung University Hsinchu, 30010, Taiwan
| | - Lain-Jong Li
- Physical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia
| | - Chien-Wen Chang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University (NTHU), Hsinchu, 30013, Taiwan
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Feng R, Ding W, Liu L, Chen L, Qiu J, Chen G. Dual-band infrared perfect absorber based on asymmetric T-shaped plasmonic array. OPTICS EXPRESS 2014; 22 Suppl 2:A335-A343. [PMID: 24922243 DOI: 10.1364/oe.22.00a335] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
An infrared dual-band perfect absorber based on asymmetric T-shaped plasmonic array is designed and numerically investigated. Two distinct absorption peaks are achieved by localized surface plasmon polariton (LSPP) mode over a wide incident angular range. Both the absorption peaks can be finely tuned independently by varying the geometry of the structure. In our proposed structure, the period of the T-shaped structures becomes less and the multiple LSPP peaks are suppressed, which result in the sideband of absorption peaks very low. This dual-band perfect absorber has potential applications such as in infrared imaging devices, thermal bolometers, and wavelength selective radiators.
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Lee S, In S, Mason DR, Park N. Incorporation of nanovoids into metallic gratings for broadband plasmonic organic solar cells. OPTICS EXPRESS 2013; 21:4055-4060. [PMID: 23481940 DOI: 10.1364/oe.21.004055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present investigation and optimization of a newly proposed plasmonic organic solar cell geometry based on the incorporation of nanovoids into conventional rectangular backplane gratings. Hybridization of strongly localized plasmonic modes of the nanovoids with Fabry-Perot cavity modes originating from surface plasmon reflection at the grating elements is shown to significantly boost performance in the long wavelength regime. This constitutes improved broadband operation while maintaining absorption enhancements at short wavelengths derived from conventional rectangular grating. Our calculations predict a figure of merit enhancement of up to 41% compared to when the nanovoid indented grating is absent. This is a significant improvement over the previously considered rectangular grating structures, which is further shown to be maintained over the entire angular range.
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Affiliation(s)
- Sangjun Lee
- Photonic Systems Laboratory, School of EECS, Seoul National University, Seoul 151-744, South Korea
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Cheng CW, Abbas MN, Chiu CW, Lai KT, Shih MH, Chang YC. Wide-angle polarization independent infrared broadband absorbers based on metallic multi-sized disk arrays. OPTICS EXPRESS 2012; 20:10376-81. [PMID: 22535127 DOI: 10.1364/oe.20.010376] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Two-dimensional metallic broadband absorbers on a SiO(2)/Ag/Si substrate were experimentally studied. The absorptivity of such structure can be increased by tailoring the ratio of disk size to the unit cell area. The metallic disk exhibits a localized surface plasmon polariton (LSPP) mode for both TE and TM polarizations. A broadband thermal emitter can be realized because the LSPP mode is independent of the periodicities. By manipulating the ratios and disk sizes, a high-performance, wide-angle, polarization-independent dual band absorber was experimentally achieved. The results demonstrated a substantial flexibility in absorber designs for applications in thermal photovoltaics, sensors, and camouflage.
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Affiliation(s)
- Cheng-Wen Cheng
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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Cheng CW, Abbas MN, Shih MH, Chang YC. Characterization of the surface plasmon polariton band gap in an Ag/SiO2/Ag T-shaped periodical structure. OPTICS EXPRESS 2011; 19:23698-23705. [PMID: 22109396 DOI: 10.1364/oe.19.023698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, the localized surface plasmon polariton (LSPP) band gap of an Ag/SiO(2)/Ag asymmetric T-shaped periodical structure is demonstrated and characterized. The Ag/SiO(2)/Ag asymmetric T-shaped periodical structure was designed and fabricated to exhibit the LSPP modes in an infrared wavelength regime, and its band gap can be manipulated through the structural geometry. The LSPP band gap was observed experimentally with the absorbance spectra and its angle dependence characterized with different incident angles. Such a T-shaped structure with a LSPP band gap can be widely exploited in various applications, such as emitters and sensors.
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Affiliation(s)
- Cheng-Wen Cheng
- Department of Physics, National Taiwan University, Taipei 10617, Taiwan
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