物理
散射
引力奇点
耦合模理论
镜像对称
光学
基质(化学分析)
奇偶性(物理)
厄米矩阵
手性(物理)
量子力学
拓扑(电路)
散射理论
手征对称性
折射率
材料科学
数学
Nambu–Jona Lasinio模型
组合数学
复合材料
夸克
作者
Xiaolin Chen,Kai Chen,Yong Zhou,Xiaoliang Ma,Wentan Fang,Wei Zhang,Hang Song,Zujie Fang,Weiqing Gao
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-10-16
卷期号:48 (21): 5503-5503
摘要
We have developed a temporal coupled-mode theory based on quasi-normal modes to investigate the chiroptical effects in parity-time (PT) symmetric metasurfaces. The PT symmetry enforces a different constraint for the direct scattering matrix and the coupling constants, which is verified by calculating the transmission spectra originating from the chiral quasi-bound states in the continuum. What’s more, the scattering matrix can be analytically continued to the complex frequency plane. We find that the zero and pole singularities of the transmission coefficients and scattering matrix play an important role in the optical chirality. The pole singularities carry a quantized topological charge of −1. Our work paves the way for studying the enhanced optical chirality in non-Hermitian metasurfaces.
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