Terahertz Sensing with Exceptional Points in Metasurfaces(Invited)
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.
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