Angle-Resolved Thermal Emission Spectroscopy Characterization of Non-Hermitian Metacrystals
Fan Zhong, Kun Ding, Ye Zhang, Shining Zhu, C. T. Chan, Hui Liu
Abstract
The current interest in non-Hermitian physics calls for a simple, reliable experimental technique to investigate energy-momentum relationships at high resolution in angle and frequency. To this end, the authors present angle-resolved thermal emission spectroscopy (ARTES), a technique that does not use the external energy sources required by conventional methods. Utilizing symmetry and radiation losses, they demonstrate several non-Hermitian dispersion features, such as non-Hermitian bulk Fermi arcs and exceptional lines, via ARTES in a synthetic parameter space. With this approach, the band-structure mapping of complicated non-Hermitian structures becomes relatively straightforward.