Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces

Abstract We propose a new family of impedance-matched chiral metasurfaces that offer arbitrary polarization control at two different frequencies. To this end, two main problems are addressed: (1) determination of the required surface impedances for a certain user-defined chiral functionality at two...

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Autores principales:	Minseok Kim, George V. Eleftheriades
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3f543b0ff4004aa5899020bc8e5406e4
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spelling	oai:doaj.org-article:3f543b0ff4004aa5899020bc8e5406e42021-12-02T16:08:02ZDesign and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces10.1038/s41598-018-20056-22045-2322https://doaj.org/article/3f543b0ff4004aa5899020bc8e5406e42018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20056-2https://doaj.org/toc/2045-2322Abstract We propose a new family of impedance-matched chiral metasurfaces that offer arbitrary polarization control at two different frequencies. To this end, two main problems are addressed: (1) determination of the required surface impedances for a certain user-defined chiral functionality at two frequencies and (2) their physical realization at microwaves. The first milestone is achieved through a proposed synthesis method that combines a semi-analytical method and a nonlinear optimization technique. In particular, the impedances are computed such that the devised chiral metasurface is also impedance-matched to a terminating medium. The chiral metasurfaces are then physically realized at microwaves by cascading layers of rotated arrays of multiple concentric rectangular copper rings. We establish that these proposed unit cells offer distinct dual-resonances that can be arbitrarily and independently tuned for two orthogonal linear polarizations at each of the two operating frequencies. This allows simultaneous physical mapping of the required surface impedances at two frequencies. The versatility and generality of the proposed numerical and physical solutions are demonstrated through two design examples: A dual-band circular polarization selective surface (CPSS) and a dual-band polarization rotator (PR). The dual-band CPSS is further confirmed experimentally at 20 GHz and 30 GHz based on a free-space quasi-optical system.Minseok KimGeorge V. EleftheriadesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-12 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Minseok Kim George V. Eleftheriades Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
description	Abstract We propose a new family of impedance-matched chiral metasurfaces that offer arbitrary polarization control at two different frequencies. To this end, two main problems are addressed: (1) determination of the required surface impedances for a certain user-defined chiral functionality at two frequencies and (2) their physical realization at microwaves. The first milestone is achieved through a proposed synthesis method that combines a semi-analytical method and a nonlinear optimization technique. In particular, the impedances are computed such that the devised chiral metasurface is also impedance-matched to a terminating medium. The chiral metasurfaces are then physically realized at microwaves by cascading layers of rotated arrays of multiple concentric rectangular copper rings. We establish that these proposed unit cells offer distinct dual-resonances that can be arbitrarily and independently tuned for two orthogonal linear polarizations at each of the two operating frequencies. This allows simultaneous physical mapping of the required surface impedances at two frequencies. The versatility and generality of the proposed numerical and physical solutions are demonstrated through two design examples: A dual-band circular polarization selective surface (CPSS) and a dual-band polarization rotator (PR). The dual-band CPSS is further confirmed experimentally at 20 GHz and 30 GHz based on a free-space quasi-optical system.
format	article
author	Minseok Kim George V. Eleftheriades
author_facet	Minseok Kim George V. Eleftheriades
author_sort	Minseok Kim
title	Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
title_short	Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
title_full	Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
title_fullStr	Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
title_full_unstemmed	Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces
title_sort	design and demonstration of impedance-matched dual-band chiral metasurfaces
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/3f543b0ff4004aa5899020bc8e5406e4
work_keys_str_mv	AT minseokkim designanddemonstrationofimpedancematcheddualbandchiralmetasurfaces AT georgeveleftheriades designanddemonstrationofimpedancematcheddualbandchiralmetasurfaces
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Design and Demonstration of Impedance-matched Dual-band Chiral Metasurfaces

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