Photonic non-Hermitian skin effect and non-Bloch bulk-boundary correspondence

The authors demonstrate a feasible design of a one-dimensional non-Hermitian Su-Schrieffer-Heeger model based on photonic coupled resonant optical waveguides. The phase transition points are different from those of the periodic boundary, thus revealing a non-Bloch bulk-boundary correspondence. Moreover, the field distribution is found to be exponentially localized at the ends of an open-boundary chain, which demonstrates a non-Hermitian skin effect.