Fig. 1: EP clarifications and applications.
From: Resonant and scattering exceptional points in non-Hermitian metasurfaces
According to the different analytical methods, the EP of the metasurface can be divided into two types: resonant EP96,97, related to the mode evaluation, and scattering EP78,79,117,127,131,133, related to the S-matrix. Based on different element combinations, the scattering EP can be further clarified. The insets are reprinted with permission from ref. 78, ref. 79, ref. 97, ref. 117. and ref. 127, from ref. 131. permitted under the Creative Commons license CC BY 4.0 and from ref. 133. permitted under the Creative Commons CC BY license.
