Exceptional point in a terahertz graphene metasurface

Chishen Huang; Binbin Wei; Hao Zhang; Jiduo Dong; Chao Li; Yaohua Du

doi:10.1117/12.2652040

23 January 2023 Exceptional point in a terahertz graphene metasurface

Chishen Huang, Binbin Wei, Hao Zhang, Jiduo Dong, Chao Li, Yaohua Du

Author Affiliations +

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 125561R (2023) https://doi.org/10.1117/12.2652040
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

Exceptional points (EPs) are special state points in a non-Hermitian system, at which both the eigenvalues and the eigenstates of the system coalesce. The parameter space around it often presents peculiar physical phenomena, such as greatly improved sensitivity. In this paper, a non-Hermitian metasurface based on patterned graphene in the terahertz frequency range is designed. Its unit cell consists of a pair of orthogonally oriented graphene split-ring-resonators with different geometries, which makes it a non-Parity-time (PT) symmetric system. The existence of the EPs is further confirmed by the coincident eigenstate polarizations and eigen transmission exchange behaviors. This work provides a basis platform for studying EP points in a graphene metasurface.

Citation Download Citation

Chishen Huang, Binbin Wei, Hao Zhang, Jiduo Dong, Chao Li, and Yaohua Du "Exceptional point in a terahertz graphene metasurface", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 125561R (23 January 2023); https://doi.org/10.1117/12.2652040

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KEYWORDS

Graphene

Polarization

Terahertz radiation

Optical spheres

Silicon

Dielectric polarization

Physical phenomena

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