| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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 Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;
2 Guilin University of Electronic Technology, Guilin 541004, China |
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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.
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Received: 21 April 2022
Revised: 24 June 2022
Accepted manuscript online: 13 July 2022
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PACS:
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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42.25.Ja
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(Polarization)
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78.67.Wj
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(Optical properties of graphene)
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| Fund: Project supported by Shenzhen Research Foundation (Grant No. JCYJ20180507182444250). |
Corresponding Authors:
Guangyuan Li
E-mail: gy.li@siat.ac.cn
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Cite this article:
Xiaoqing Luo(罗小青), Juan Luo(罗娟), Fangrong Hu(胡放荣), and Guangyuan Li(李光元) Graphene metasurface-based switchable terahertz half-/quarter-wave plate with a broad bandwidth 2023 Chin. Phys. B 32 027801
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