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Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances

We applied the harmonic oscillator model combined with the transfer matrix method to study the polarization conversion for transmitted waves in metallic grating/plasmon-excitation layer/metallic grating structure in the terahertz (THz) region. By comparing the calculated spectra and the simulated (b...

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Autores principales: Yu, Anqi, Yu, Dahai, Yang, Zhenyu, Guo, Xuguang, Ren, Yuxiang, Zang, Xiaofei, Balakin, Alexei V., Shkurinov, Alexander P., Zhu, YiMing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7823980/
https://www.ncbi.nlm.nih.gov/pubmed/33379402
http://dx.doi.org/10.3390/nano11010056
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author Yu, Anqi
Yu, Dahai
Yang, Zhenyu
Guo, Xuguang
Ren, Yuxiang
Zang, Xiaofei
Balakin, Alexei V.
Shkurinov, Alexander P.
Zhu, YiMing
author_facet Yu, Anqi
Yu, Dahai
Yang, Zhenyu
Guo, Xuguang
Ren, Yuxiang
Zang, Xiaofei
Balakin, Alexei V.
Shkurinov, Alexander P.
Zhu, YiMing
author_sort Yu, Anqi
collection PubMed
description We applied the harmonic oscillator model combined with the transfer matrix method to study the polarization conversion for transmitted waves in metallic grating/plasmon-excitation layer/metallic grating structure in the terahertz (THz) region. By comparing the calculated spectra and the simulated (by the finite-difference-time-domain method) ones, we found that they correspond well with each other. Both methods show that the Drude background absorption and the excited plasmon resonances are responsible for polarization conversion. The transmission is close to 0 when the distance between the top/bottom metallic gratings and gated graphene is an integer multiple of half the wavelength of the incident wave (in the dielectrics), at which points the plasmon resonances are greatly suppressed by the destructive interference between the backward/forward electromagnetic waves and that reflected by the top/bottom metallic gratings. Away from these points, the transmission can be higher than 80%. The electron density and the excitation efficiency of the plasmon-excitation layer were found to be important for the bandwidth of the polarization conversion window, while the scattering rate was found to influence mainly the polarization conversion rate. Multi-broadband polarization conversion is realized by exciting plasmon modes between the 0 transmission points in the THz region.
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spelling pubmed-78239802021-01-24 Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances Yu, Anqi Yu, Dahai Yang, Zhenyu Guo, Xuguang Ren, Yuxiang Zang, Xiaofei Balakin, Alexei V. Shkurinov, Alexander P. Zhu, YiMing Nanomaterials (Basel) Article We applied the harmonic oscillator model combined with the transfer matrix method to study the polarization conversion for transmitted waves in metallic grating/plasmon-excitation layer/metallic grating structure in the terahertz (THz) region. By comparing the calculated spectra and the simulated (by the finite-difference-time-domain method) ones, we found that they correspond well with each other. Both methods show that the Drude background absorption and the excited plasmon resonances are responsible for polarization conversion. The transmission is close to 0 when the distance between the top/bottom metallic gratings and gated graphene is an integer multiple of half the wavelength of the incident wave (in the dielectrics), at which points the plasmon resonances are greatly suppressed by the destructive interference between the backward/forward electromagnetic waves and that reflected by the top/bottom metallic gratings. Away from these points, the transmission can be higher than 80%. The electron density and the excitation efficiency of the plasmon-excitation layer were found to be important for the bandwidth of the polarization conversion window, while the scattering rate was found to influence mainly the polarization conversion rate. Multi-broadband polarization conversion is realized by exciting plasmon modes between the 0 transmission points in the THz region. MDPI 2020-12-28 /pmc/articles/PMC7823980/ /pubmed/33379402 http://dx.doi.org/10.3390/nano11010056 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yu, Anqi
Yu, Dahai
Yang, Zhenyu
Guo, Xuguang
Ren, Yuxiang
Zang, Xiaofei
Balakin, Alexei V.
Shkurinov, Alexander P.
Zhu, YiMing
Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title_full Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title_fullStr Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title_full_unstemmed Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title_short Terahertz Broadband Polarization Conversion for Transmitted Waves Based on Graphene Plasmon Resonances
title_sort terahertz broadband polarization conversion for transmitted waves based on graphene plasmon resonances
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7823980/
https://www.ncbi.nlm.nih.gov/pubmed/33379402
http://dx.doi.org/10.3390/nano11010056
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