Abstract
Spin-selective absorption is broadly applicable to numerous photonic devices. Here, based on a stereoscopic full metallic resonator array, a terahertz chiral metasurface with a single-layer structure is proposed and numerically demonstrated. By employing the coupled-mode theory, we demonstrate that the chiral metasurface can near-perfectly absorb one circularly polarized wave in the quasi-bound states in the continuum-induced critical coupling region but non-resonantly reflect its counterparts. Interestingly, the linewidths and handedness of the proposed chiral metasurface can be flexibly controlled by an in-plane symmetry perturbation. Our designs might offer an alternative strategy to develop chiral metasurfaces apart from conventional methods and might stimulate many potential applications for emerging terahertz technologies.
© 2022 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Shun Wan, Keda Wang, Fatian Wang, Chunying Guan, Wenjia Li, Jianlong Liu, Andrey Bogdanov, Pavel A. Belov, and Jinhui Shi
Opt. Lett. 47(13) 3291-3294 (2022)
Shi Li, Tian Sang, Chaoyu Yang, Junjian Lu, and Yueke Wang
Opt. Lett. 48(24) 6488-6491 (2023)
Haocheng Cai, Jitao Li, and Luhong Mao
Opt. Lett. 48(10) 2559-2562 (2023)