超表面奇异点太赫兹传感(特邀)

Terahertz Sensing with Exceptional Points in Metasurfaces(Invited)

奇异点是非厄米系统中的奇点,由两个或多个特征值及其相应的特征向量同时简并产生。超表面是在亚波长尺度上构建的二维人工电磁材料,其结构和性能的人工可设计性为研究非厄米现象提供了新的途径。本文首先介绍了非厄米系统和奇异点的基本理论并概述了奇异点的最新研究进展,之后介绍了超表面奇异点太赫兹传感的研究进展,最后总结了奇异点传感仍然存在的问题,并展望其发展趋势。

Exceptional points are singularities in non-Hermitian systems,generated when two or more eigenvalues and their corresponding eigenvectors merge simultaneously.Metasurfaces are two-dimensional artificial electromagnetic materials constructed at subwavelength scales,which provide a versatile platform for studying this non-Hermitian phenomenon by introducing dissipation and amplification within their unit cells.This paper provides an overview of the latest research progress in exceptional points sensing.It begins by introducing the basic theory of non-Hermitian systems and exceptional points,then focuses on the research achievements in exceptional points sensing on metasurfaces in terahertz band.Lastest,we summarize the disadvantages of exceptional points sensing,and its future development trends are also discussed.