Tunable broadband polarization converters based on coded graphene metasurfaces

Abstract In this paper, two optimization algorithms (randomly initialized hill climbing and genetic algorithms) are considered to design broadband polarization converters based on coded metasurfaces. A pixeled graphene patch with an elliptic structure is proposed for the initial solution. Each pixel...

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Autores principales:	Ali Khajeh, Zahra Hamzavi-Zarghani, Alireza Yahaghi, Ali Farmani
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9b524823cc9149f2910ad5fed5209065
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spelling	oai:doaj.org-article:9b524823cc9149f2910ad5fed52090652021-12-02T14:01:19ZTunable broadband polarization converters based on coded graphene metasurfaces10.1038/s41598-020-80493-w2045-2322https://doaj.org/article/9b524823cc9149f2910ad5fed52090652021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-80493-whttps://doaj.org/toc/2045-2322Abstract In this paper, two optimization algorithms (randomly initialized hill climbing and genetic algorithms) are considered to design broadband polarization converters based on coded metasurfaces. A pixeled graphene patch with an elliptic structure is proposed for the initial solution. Each pixel can be 1 and 0 which represents the presence and absence of the graphene. The initial guess tends to the optimum configuration after several optimization processes. Four broadband polarization converters are designed utilizing the optimization algorithms. By changing the chemical potential of graphene, the operation frequency of the polarization converters can be adjusted. Furthermore, the effects of relaxation time of graphene and incident angle on the polarization conversion bandwidth of the four designed structures are investigated.Ali KhajehZahra Hamzavi-ZarghaniAlireza YahaghiAli FarmaniNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ali Khajeh Zahra Hamzavi-Zarghani Alireza Yahaghi Ali Farmani Tunable broadband polarization converters based on coded graphene metasurfaces
description	Abstract In this paper, two optimization algorithms (randomly initialized hill climbing and genetic algorithms) are considered to design broadband polarization converters based on coded metasurfaces. A pixeled graphene patch with an elliptic structure is proposed for the initial solution. Each pixel can be 1 and 0 which represents the presence and absence of the graphene. The initial guess tends to the optimum configuration after several optimization processes. Four broadband polarization converters are designed utilizing the optimization algorithms. By changing the chemical potential of graphene, the operation frequency of the polarization converters can be adjusted. Furthermore, the effects of relaxation time of graphene and incident angle on the polarization conversion bandwidth of the four designed structures are investigated.
format	article
author	Ali Khajeh Zahra Hamzavi-Zarghani Alireza Yahaghi Ali Farmani
author_facet	Ali Khajeh Zahra Hamzavi-Zarghani Alireza Yahaghi Ali Farmani
author_sort	Ali Khajeh
title	Tunable broadband polarization converters based on coded graphene metasurfaces
title_short	Tunable broadband polarization converters based on coded graphene metasurfaces
title_full	Tunable broadband polarization converters based on coded graphene metasurfaces
title_fullStr	Tunable broadband polarization converters based on coded graphene metasurfaces
title_full_unstemmed	Tunable broadband polarization converters based on coded graphene metasurfaces
title_sort	tunable broadband polarization converters based on coded graphene metasurfaces
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9b524823cc9149f2910ad5fed5209065
work_keys_str_mv	AT alikhajeh tunablebroadbandpolarizationconvertersbasedoncodedgraphenemetasurfaces AT zahrahamzavizarghani tunablebroadbandpolarizationconvertersbasedoncodedgraphenemetasurfaces AT alirezayahaghi tunablebroadbandpolarizationconvertersbasedoncodedgraphenemetasurfaces AT alifarmani tunablebroadbandpolarizationconvertersbasedoncodedgraphenemetasurfaces
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Tunable broadband polarization converters based on coded graphene metasurfaces

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