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Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials

The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edge...

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Autores principales: Zhuo, Liqiang, He, Huiru, Huang, Ruimin, Su, Shaojian, Lin, Zhili, Qiu, Weibin, Huang, Beiju, Kan, Qiang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308290/
https://www.ncbi.nlm.nih.gov/pubmed/34361194
http://dx.doi.org/10.3390/nano11071808
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author Zhuo, Liqiang
He, Huiru
Huang, Ruimin
Su, Shaojian
Lin, Zhili
Qiu, Weibin
Huang, Beiju
Kan, Qiang
author_facet Zhuo, Liqiang
He, Huiru
Huang, Ruimin
Su, Shaojian
Lin, Zhili
Qiu, Weibin
Huang, Beiju
Kan, Qiang
author_sort Zhuo, Liqiang
collection PubMed
description The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation.
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spelling pubmed-83082902021-07-25 Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials Zhuo, Liqiang He, Huiru Huang, Ruimin Su, Shaojian Lin, Zhili Qiu, Weibin Huang, Beiju Kan, Qiang Nanomaterials (Basel) Article The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation. MDPI 2021-07-12 /pmc/articles/PMC8308290/ /pubmed/34361194 http://dx.doi.org/10.3390/nano11071808 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhuo, Liqiang
He, Huiru
Huang, Ruimin
Su, Shaojian
Lin, Zhili
Qiu, Weibin
Huang, Beiju
Kan, Qiang
Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title_full Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title_fullStr Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title_full_unstemmed Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title_short Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials
title_sort group velocity modulation and light field focusing of the edge states in chirped valley graphene plasmonic metamaterials
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8308290/
https://www.ncbi.nlm.nih.gov/pubmed/34361194
http://dx.doi.org/10.3390/nano11071808
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