无源非厄密超构表面奇异点现象研究进展  

Research progress in the phenomenon of exceptional point on passive non-Hermitian metasurfaces

作　　者：卓奕州 韦中超[1] ZHUO Yi-zhou;WEI Zhong-chao(School of Optoelectronic Science and Engineering,South China Normal University,Guangzhou 510006,China)

机构地区：[1]华南师范大学光电科学与工程学院,广东广州510006

出　　处：《中国光学(中英文)》2025年第1期17-28,共12页Chinese Optics

基　　金：国家自然科学基金(No.61774062);广东省自然科学基金(No.2021A1515010352);华南师范大学研究生科研创新计划项目(No.2024KYLX073)。

摘　　要：在非厄密系统中,调节系统的增益或损耗可以使系统状态从PT对称向PT对称破缺转变,转变过程中存在一个特殊的状态转变点,使得系统本征值和本征态同时简并,该点称为奇异点。奇异点结合超构表面产生了许多有趣的光学现象:不对称传输、拓扑相位、非厄密趋肤效应等。然而引入增益的有源超构表面在实验上很难实现,因此利用系统损耗构建虚拟增益的无源超构表面成为非厄密研究的有力武器。本文将从无源非厄密超构表面奇异点的理论模型、研究进展、具体应用和实验设计4个方面进行综述,并对该领域未来的发展方向进行展望。In non-Hermitian systems,controlling the gain or loss of the system can enable the system state transition from PT-symmetry to broken PT-symmetry.This transition leads to a special point known as the exceptional point,where the system eigenvalues and eigenstates become simultaneously degenerate.When combined with metasurfaces,the exceptional point leads to various intriguing optical phenomena,such as asymmetric transmission,exceptional topological phase,and the non-Hermitian skinning effect.However,active metasurfaces introducing gains are difficult to realize experimentally.Therefore,designing passive metasurfaces using equivalent gains through loss becomes a powerful tool in non-Hermitian research.In this paper,we review the theoretical models,research progress,specific applications,and experimental design in the study of the exceptional point on passive non-Hermitian metasurfaces and look forward to the future direction of this field.

关 键 词：奇异点 非厄密 超构表面 无源系统 

分 类 号：TN241[电子电信—物理电子学] TN305.7