Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces

Dynamic phase modulation is vital for tuneable focusing, beaming, polarisation conversion and holography. However, it remains challenging to achieve full 360° dynamic phase modulation while maintaining high reflectance or transmittance based on metamaterials or metasurfaces in the terahertz regime....

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Autores principales:	Binxu Wang, Xiaoqing Luo, Yalin Lu, Guangyuan Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	graphene metasurface phase modulation terahertz Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/3385efe41d5a43ecab53a275cc879542
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id	oai:doaj.org-article:3385efe41d5a43ecab53a275cc879542
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spelling	oai:doaj.org-article:3385efe41d5a43ecab53a275cc8795422021-11-25T18:32:53ZFull 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces10.3390/nano111131572079-4991https://doaj.org/article/3385efe41d5a43ecab53a275cc8795422021-11-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/3157https://doaj.org/toc/2079-4991Dynamic phase modulation is vital for tuneable focusing, beaming, polarisation conversion and holography. However, it remains challenging to achieve full 360° dynamic phase modulation while maintaining high reflectance or transmittance based on metamaterials or metasurfaces in the terahertz regime. Here, we propose a doubly resonant graphene–metal hybrid metasurface to address this challenge. Simulation results show that by varying the graphene Fermi energy, the proposed metasurface with two shifting resonances is capable of providing dynamic phase modulation covering a range of 361° while maintaining relatively high reflectance above 20% at 1.05 THz. Based on the phase profile design, dynamically tuneable beam steering and focusing were numerically demonstrated. We expect that this work will advance the engineering of graphene metasurfaces for the dynamic manipulation of terahertz waves.Binxu WangXiaoqing LuoYalin LuGuangyuan LiMDPI AGarticlegraphenemetasurfacephase modulationterahertzChemistryQD1-999ENNanomaterials, Vol 11, Iss 3157, p 3157 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	graphene metasurface phase modulation terahertz Chemistry QD1-999
spellingShingle	graphene metasurface phase modulation terahertz Chemistry QD1-999 Binxu Wang Xiaoqing Luo Yalin Lu Guangyuan Li Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
description	Dynamic phase modulation is vital for tuneable focusing, beaming, polarisation conversion and holography. However, it remains challenging to achieve full 360° dynamic phase modulation while maintaining high reflectance or transmittance based on metamaterials or metasurfaces in the terahertz regime. Here, we propose a doubly resonant graphene–metal hybrid metasurface to address this challenge. Simulation results show that by varying the graphene Fermi energy, the proposed metasurface with two shifting resonances is capable of providing dynamic phase modulation covering a range of 361° while maintaining relatively high reflectance above 20% at 1.05 THz. Based on the phase profile design, dynamically tuneable beam steering and focusing were numerically demonstrated. We expect that this work will advance the engineering of graphene metasurfaces for the dynamic manipulation of terahertz waves.
format	article
author	Binxu Wang Xiaoqing Luo Yalin Lu Guangyuan Li
author_facet	Binxu Wang Xiaoqing Luo Yalin Lu Guangyuan Li
author_sort	Binxu Wang
title	Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
title_short	Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
title_full	Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
title_fullStr	Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
title_full_unstemmed	Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces
title_sort	full 360° terahertz dynamic phase modulation based on doubly resonant graphene–metal hybrid metasurfaces
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/3385efe41d5a43ecab53a275cc879542
work_keys_str_mv	AT binxuwang full360terahertzdynamicphasemodulationbasedondoublyresonantgraphenemetalhybridmetasurfaces AT xiaoqingluo full360terahertzdynamicphasemodulationbasedondoublyresonantgraphenemetalhybridmetasurfaces AT yalinlu full360terahertzdynamicphasemodulationbasedondoublyresonantgraphenemetalhybridmetasurfaces AT guangyuanli full360terahertzdynamicphasemodulationbasedondoublyresonantgraphenemetalhybridmetasurfaces
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Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces

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