中国物理B ›› 2022, Vol. 31 ›› Issue (9): 94201-094201.doi: 10.1088/1674-1056/ac5884

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Dual-function terahertz metasurface based on vanadium dioxide and graphene

Jiu-Sheng Li(李九生)† and Zhe-Wen Li(黎哲文)   

  1. Centre for THz Research, China Jiliang University, Hangzhou 310018, China
  • 收稿日期:2021-10-08 修回日期:2022-01-24 接受日期:2022-02-25 出版日期:2022-08-19 发布日期:2022-08-24
  • 通讯作者: Jiu-Sheng Li E-mail:lijsh@cjlu.edu.cn
  • 基金资助:
    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).

Dual-function terahertz metasurface based on vanadium dioxide and graphene

Jiu-Sheng Li(李九生)† and Zhe-Wen Li(黎哲文)   

  1. Centre for THz Research, China Jiliang University, Hangzhou 310018, China
  • Received:2021-10-08 Revised:2022-01-24 Accepted:2022-02-25 Online:2022-08-19 Published:2022-08-24
  • Contact: Jiu-Sheng Li E-mail:lijsh@cjlu.edu.cn
  • Supported by:
    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).

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摘要： 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.

关键词: metasurface, switchable terahertz absorber, electromagnetically induced transparency

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.

Key words: metasurface, switchable terahertz absorber, electromagnetically induced transparency

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
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)