本项目以光子人工微结构为平台，研究在Exceptional points（以下简称EP）附近的模式耦合及相关新特新。项目的研究目标是通过仔细调整微结构参数，弄清电磁模式耦合的调控机制，实现对EP的精确操控，从而利用电磁波与光子人工微结构的相互作用，对EP附近新奇的非厄米物理效应展开研究，探索利用微结构进行电磁波调控的新机理。主要研究内容包括：人工微结构中模式耦合的调控机制和关键参量，实现对EP的精确操控；EP附近的非厄米物理效应，包括EP的拓扑结构，本征态的内禀手性和共振捕获，以及散射谱对损耗和耦合超灵敏的依赖关系；宇称-时间相变点的性质，及其与一般EP的区别和联系。通过以上研究，不仅可以加深对非厄米体系EP相关的诸多新物理效应的认识，而且可以帮助人们更好地利用各种电磁模式耦合，来调控电磁波的传播和与物质的相互作用。项目的研究成果不仅有重要的科学意义，而且对相关器件的应用有广泛的指导意义。

Based on engineered photonic structures, the proposed project aims to study the mode coupling and related new properties near exceptional points (EP). We will clarify the mechanism of mode coupling and achieve precise control of EP by carefully tuning microstructure, and then studies the non-Hermitian physics near EP with the use of interaction of electromagnetic wave with engineered photonic structures. The project mainly focuses on the following aspects: First, we will study the mechanisms and key parameters of engineered photonic structures in mode coupling to achieve precise control of the EP; Second, We will investigate the non-Hermitian physics near EP, including the topological structure of EP, the intrinsic chirality and resonance trapping of eigenstates, and the ultra-sensitivity of the scattering spectrum to loss and coupling; Finally, we will study the phase transition point in parity-time symmetric structures by comparing the transition point with EP in general non-Hermitian structures. We expect, based on the study of the project, to get better understanding of the EP-related novel effects in non-Hermitian systems which are difficult to study in original quantum systems, on one hand. On the other hand, the scientific research of the project may be important for potential applications of EP-related non-Hermitian effects in photonic and electromagnetic devices.