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Non-Hermitian chiral degeneracy of gated graphene metasurfaces
Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investig...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10079968/ https://www.ncbi.nlm.nih.gov/pubmed/37024464 http://dx.doi.org/10.1038/s41377-023-01121-6 |
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author | Baek, Soojeong Park, Sang Hyun Oh, Donghak Lee, Kanghee Lee, Sangha Lim, Hosub Ha, Taewoo Park, Hyun Sung Zhang, Shuang Yang, Lan Min, Bumki Kim, Teun-Teun |
author_facet | Baek, Soojeong Park, Sang Hyun Oh, Donghak Lee, Kanghee Lee, Sangha Lim, Hosub Ha, Taewoo Park, Hyun Sung Zhang, Shuang Yang, Lan Min, Bumki Kim, Teun-Teun |
author_sort | Baek, Soojeong |
collection | PubMed |
description | Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner. Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface. More specifically, the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP. Interestingly, the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface, revealing the missing dimension at the chiral EP. In addition, the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and, consequently, the observation of enhanced asymmetric polarisation conversion. We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs. |
format | Online Article Text |
id | pubmed-10079968 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-100799682023-04-08 Non-Hermitian chiral degeneracy of gated graphene metasurfaces Baek, Soojeong Park, Sang Hyun Oh, Donghak Lee, Kanghee Lee, Sangha Lim, Hosub Ha, Taewoo Park, Hyun Sung Zhang, Shuang Yang, Lan Min, Bumki Kim, Teun-Teun Light Sci Appl Article Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive manner. Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated graphene metasurface. More specifically, the measured non-Hermitian Jones matrix in parameter space enables the quantification of nonorthogonality of polarisation eigenstates and half-integer topological charges associated with a chiral EP. Interestingly, the output polarisation state can be made orthogonal to the coalesced polarisation eigenstate of the metasurface, revealing the missing dimension at the chiral EP. In addition, the maximal nonorthogonality at the chiral EP leads to a blocking of one of the cross-polarised transmission pathways and, consequently, the observation of enhanced asymmetric polarisation conversion. We anticipate that electrically controllable non-Hermitian metasurface platforms can serve as an interesting framework for the investigation of rich non-Hermitian polarisation dynamics around chiral EPs. Nature Publishing Group UK 2023-04-06 /pmc/articles/PMC10079968/ /pubmed/37024464 http://dx.doi.org/10.1038/s41377-023-01121-6 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Baek, Soojeong Park, Sang Hyun Oh, Donghak Lee, Kanghee Lee, Sangha Lim, Hosub Ha, Taewoo Park, Hyun Sung Zhang, Shuang Yang, Lan Min, Bumki Kim, Teun-Teun Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title | Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title_full | Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title_fullStr | Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title_full_unstemmed | Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title_short | Non-Hermitian chiral degeneracy of gated graphene metasurfaces |
title_sort | non-hermitian chiral degeneracy of gated graphene metasurfaces |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10079968/ https://www.ncbi.nlm.nih.gov/pubmed/37024464 http://dx.doi.org/10.1038/s41377-023-01121-6 |
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