中国物理B ›› 2023, Vol. 32 ›› Issue (2): 27801-027801.doi: 10.1088/1674-1056/ac80a8

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Graphene metasurface-based switchable terahertz half-/quarter-wave plate with a broad bandwidth

Xiaoqing Luo(罗小青)1, Juan Luo(罗娟)1,2, Fangrong Hu(胡放荣)2, and Guangyuan Li(李光元)1,†   

  1. 1 Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;
    2 Guilin University of Electronic Technology, Guilin 541004, China
  • 收稿日期:2022-04-21 修回日期:2022-06-24 接受日期:2022-07-13 出版日期:2023-01-10 发布日期:2023-01-10
  • 通讯作者: Guangyuan Li E-mail:gy.li@siat.ac.cn
  • 基金资助:
    Project supported by Shenzhen Research Foundation (Grant No. JCYJ20180507182444250).

Graphene metasurface-based switchable terahertz half-/quarter-wave plate with a broad bandwidth

Xiaoqing Luo(罗小青)1, Juan Luo(罗娟)1,2, Fangrong Hu(胡放荣)2, and Guangyuan Li(李光元)1,†   

  1. 1 Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;
    2 Guilin University of Electronic Technology, Guilin 541004, China
  • Received:2022-04-21 Revised:2022-06-24 Accepted:2022-07-13 Online:2023-01-10 Published:2023-01-10
  • Contact: Guangyuan Li E-mail:gy.li@siat.ac.cn
  • Supported by:
    Project supported by Shenzhen Research Foundation (Grant No. JCYJ20180507182444250).

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摘要： Metasurfaces incorporating graphene hold great promise for the active manipulation of terahertz waves. However, it remains challenging to design a broadband graphene-based terahertz metasurface with switchable functionality of half-wave plate (HWP) and quarter-wave plate (QWP). Here, we propose a graphene-metal hybrid metasurface for achieving broadband switchable HWP/QWP in the terahertz regime. Simulation results show that, by varying the Fermi energy of graphene from 0 eV to 1 eV, the function of the reflective metasurface can be switched from an HWP with polarization conversion ratio exceeding 97% over a wide band ranging from 0.7 THz to 1.3 THz, to a QWP with ellipticity above 0.92 over 0.78 THz-1.33 THz. The sharing bandwidth reaches up to 0.52 THz and the relative bandwidth is as high as 50%. We expect this broadband and dynamically switchable terahertz HWP/QWP will find applications in terahertz sensing, imaging, and telecommunications.

关键词: terahertz metasurface, waveplate, graphene, reconfigurable

Abstract: Metasurfaces incorporating graphene hold great promise for the active manipulation of terahertz waves. However, it remains challenging to design a broadband graphene-based terahertz metasurface with switchable functionality of half-wave plate (HWP) and quarter-wave plate (QWP). Here, we propose a graphene-metal hybrid metasurface for achieving broadband switchable HWP/QWP in the terahertz regime. Simulation results show that, by varying the Fermi energy of graphene from 0 eV to 1 eV, the function of the reflective metasurface can be switched from an HWP with polarization conversion ratio exceeding 97% over a wide band ranging from 0.7 THz to 1.3 THz, to a QWP with ellipticity above 0.92 over 0.78 THz-1.33 THz. The sharing bandwidth reaches up to 0.52 THz and the relative bandwidth is as high as 50%. We expect this broadband and dynamically switchable terahertz HWP/QWP will find applications in terahertz sensing, imaging, and telecommunications.

Key words: terahertz metasurface, waveplate, graphene, reconfigurable

中图分类号:  (Multilayers; superlattices; photonic structures; metamaterials)

  • 78.67.Pt
42.25.Ja (Polarization) 78.67.Wj (Optical properties of graphene)