Dual-function terahertz metasurface based on vanadium dioxide and graphene

doi:10.1088/1674-1056/ac5884

Abstract A dual-function terahertz metasurface based on VO₂ and graphene is proposed in this paper. It consists of a gold layer embedded with VO₂ patches, a SiO₂ spacer layer, a VO₂ layer, graphene and a SiO₂ spacer substrate. When the bottom VO₂ layer is in the metallic state, the designed metasurface can achieve absorption. When the top VO₂ patches are in the metallic state, the proposed metasurface can be used as a single-band absorber with terahertz absorptance of 99.7% at 0.736 THz. When the top VO₂ patches are in the insulating state, the designed structure behaves as a dual-band absorber with an absorptance of 98.9% at 0.894 THz and 99.9% at 1.408 THz. In addition, the absorber is polarization insensitive and keeps good performance at large angles of incidence. When the bottom VO₂ is in an insulating state, the metasurface shows electromagnetically induced transparency. The transparent window can be dynamically regulated by controlling the chemical potential of graphene. The proposed metasurface exhibits the advantages of terahertz absorption, electromagnetically induced transparency and dynamic control, which provides more options for the design of terahertz devices in the future.

Keywords: metasurface switchable terahertz absorber electromagnetically induced transparency

Received: 08 October 2021
Revised: 24 January 2022
Accepted manuscript online: 25 February 2022

PACS:	42.25.Bs	(Wave propagation, transmission and absorption)
	42.50.Gy	(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
	78.20.Bh	(Theory, models, and numerical simulation)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61871355 and 61831012), the Talent Project of Zhejiang Provincial Department of Science and Technology (Grant No. 2018R52043), Zhejiang Key Research and Development Project of China (Grant Nos. 2021C03153 and 2022C03166), and Research Funds for the Provincial Universities of Zhejiang (Grant No. 2020YW20).

Corresponding Authors: Jiu-Sheng Li
E-mail: lijsh@cjlu.edu.cn

Cite this article:

Jiu-Sheng Li(李九生)^† and Zhe-Wen Li(黎哲文) Dual-function terahertz metasurface based on vanadium dioxide and graphene 2022 Chin. Phys. B 31 094201

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Dual-function terahertz metasurface based on vanadium dioxide and graphene

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