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Design of periodic metal-insulator-metal waveguide back structures for the enhancement of light absorption in thin-film solar cells

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Chinese Physics B 2011年第9期20卷 192-197页

作者：郑改革蒋剑莉咸冯林强海霞武虹李相银 School of Science Nanjing University of Science and Technology

To increase the absorption in a thin layer of absorbing material （amorphous silicon, a-Si）, a light trapping design is presented. The designed structure incorporates periodic metal-insulator-metal waveguides to enhance the optical path length of light within the solar cells. The new design can result in broadband optical absorption enhancement not only for transverse magnetic （TM）-polarized light, but also for transverse electric （TE）-polarized light. No plasmonic modes can be excited in TE-polarization, but because of the coupling into the a-Si planar waveguide guiding modes and the diffraction of light by the bottom periodic structures into higher diffraction orders, the total absorption in the active region is also increased. The results from rigorous coupled wave analysis show that the overall optical absorption in the active layer can be greatly enhanced by up to 40%. The designed structures presented in this paper can be integrated with back contact technology to potentially produce high-efficiency thin-film solar cell devices.

关键词： thin-film solar cells metal-insulator-metal waveguide enhanced optical absorption rig-orous coupled wave analysis

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Generation of tunable superchiral spot in metal-insulator-metal waveguide

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Chinese Optics Letters 2023年第1期21卷 125-130页

作者：庄涛胡海峰詹其文 School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Zhangjiang Laboratory Shanghai 201204China Shanghai Key Laboratory of Modern Optical System University of Shanghai for Science and TechnologyShanghai 200093China

The chiral feature of an optical field can be evaluated by the parameter of g-factor enhancement,which is helpful to enhance chiroptic signals from a chiral *** this work,the superchiral spot has been theoretically proposed in metal-insulator-metal *** g-factor enhancement of the superchiral spot can be enhanced by 67-fold more than that of circularly polarized light,and the spot is confined in the deep wavelength scale along each spatial ***,the position of the superchiral spot can be tuned by manipulating the incident *** tunable superchiral spot may find applications in chiral imaging and sensing.

关键词： circular dichroism superchiral spot radially polarized beam metal-insulator-metal waveguide

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Highly Sensitive Refractive Index Sensor Based on Plasmonic Bow Tie Configuration

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Photonic Sensors 2020年第3期10卷 223-232页

作者： Muhammad Ali BUTT Nikolay Lvovich KAZANSKIY Svetlana Nikolaevna KHONINA Department of Technical Cybernetic Samara National Research UniversitySamara 443086Russia Institute of RAS-Branch of the FSRC“Crystallography and Photonics” RAS151 MolodogvardeiskayaSamara 443001Russia

We propose a highly refractive index sensor based on plasmonic Bow Tie *** sensitivity of the resonator design is enhanced by incorporating a nanowall(NW)in a modified Bow Tie design where sharp tips of V-junction are *** approach provides high confinement of electric field distribution of surface plasmon polariton(SPP)mode in the narrow region of the ***,the effective refractive index(neff)of the mode increases and is highly responsive to the ambient *** sensitivity analysis of the SPP mode is calculated for six resonator *** results suggest that the NW embedded cavity offers the highest mode sensitivity due to the large shift of effective index when exposed to a slight change in the medium refractive ***,the device sensitivity of the proposed design is approximated at 2300 nm/RIU which is much higher than the sensitivity of the standard Bow Tie configuration.

关键词： Bow Tie configuration plasmonic sensor metal-insulator-metal waveguide refractive index sensor

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Enhanced Plasmonic-Induced Absorption Using a Cascade Scheme and Its Application as Refractive-Index Sensor

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Photonic Sensors 2020年第2期10卷 162-170页

作者： Xinyi LI Daobin WANG Shoupeng WANG Lihua YUAN Jingli LEI Xiaoxiao LI School of Architecture&Urban Planning Lanzhou Jiaotong UniversityLanzhou 730070China School of Science Lanzhou University of TechnologyLanzhou 730050China

In this paper,we describe a new method to improve fast-light transmission,which uses *** design a simple plasmonic device that enables plasmonic-induced absorption(PIA).It consists mainly of two parallel rectangular *** numerical results simulated by using the finite element method(FEM)confirm its *** corresponding group delay-time can reach-0.146 ps for the PIA *** on this result,we propose a cascade device,with the dual-rectangular cavity system as building block,to improve fast-light transmission even *** results indicate that the cascade scheme can increase the group delay-time to-0.456 ps,which means the fast-light feature is substantially enhanced compared with the non-cascading *** effect of the distance between two cascade resonators and other structural parameters is also ***,we use this design concept to build a refractive-index sensor with a sensitivity of 701 nm/RIU.

关键词： Plasmonic-induced absorption fast light metal-insulator-metal waveguide finite element method

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