Wave scattering on a domain wall in a chain of PT-symmetric couplers

Details Wave scattering on a domain wall in a chain of PT-symmetric couplers Wave scattering on a domain wall in a chain of PT-symmetric couplers

2012-02-25

arxiv.org/abs/1202.5629v1

Physics

Optics

7 pages, 9 figures, Physical Review A, in press

Scientific paper

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.

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