Hybrid tunable chiral metasurfaces for amplitude and wavefront control of circularly polarized terahertz wave

Jie Li; Jitao Li; Chenglong Zheng; Hongliang Zhao; Tengteng Li; Qingyan Li; Yating Zhang; Jianquan Yao

doi:10.1117/12.2573302

10 October 2020 Hybrid tunable chiral metasurfaces for amplitude and wavefront control of circularly polarized terahertz wave

Jie Li, Jitao Li, Chenglong Zheng, Hongliang Zhao, Tengteng Li, Qingyan Li, Yating Zhang, Jianquan Yao

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Proceedings Volume 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII; 115590K (2020) https://doi.org/10.1117/12.2573302
Event: SPIE/COS Photonics Asia, 2020, Online Only

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Abstract

Chiral metasurfaces can realize strong chiral optical responses and various spin-dependent electromagnetic manipulations. In this paper, we propose a metal-graphene hybrid metasurface that achieves active control of the amplitude and wavefront of reflected circularly polarized terahertz wave. By introducing a single layer graphene at the bottom of the patterned metasurface, combined with the silicon layer for voltage control, continuous change of the circular dichroism (CD) from 0 to 0.6 is obtained. Then we realized dynamic switching of the terahertz beam from anomalous reflection to vertical reflection using Pancharatnam-Berry (P-B) phase. This tunable chiral metasurface provides new ideas for the design of terahertz devices.

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Jie Li, Jitao Li, Chenglong Zheng, Hongliang Zhao, Tengteng Li, Qingyan Li, Yating Zhang, and Jianquan Yao "Hybrid tunable chiral metasurfaces for amplitude and wavefront control of circularly polarized terahertz wave", Proc. SPIE 11559, Infrared, Millimeter-Wave, and Terahertz Technologies VII, 115590K (10 October 2020); https://doi.org/10.1117/12.2573302

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