%0 Journal Article
%T Wave scattering on a domain wall in a chain of PT-symmetric couplers
%A Sergey V. Suchkov
%A Sergey V. Dmitriev
%A Boris A. Malomed
%A Yuri S. Kivshar
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevA.85.033825
%X We study wave propagation in linear arrays composed of pairs of conjugate waveguides with balanced gain and loss, i.e. arrays of the PT-symmetric couplers, where the linear spectrum is known to feature high-frequency and low-frequency branches. We introduce a domain wall by switching the gain and loss in a half of the array, and analyze the scattering of linear waves on this defect. The analysis reveals two major effects: amplification of both reflected and transmitted waves, and excitation of the reflected and transmitted low-frequency and high-frequency waves by the incident high-frequency and low-frequency waves, respectively.
%U http://arxiv.org/abs/1202.5629v1