Abstract
We study wave propagation in linear arrays composed of pairs of conjugate waveguides with balanced gain and loss, that is, arrays of 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 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.
Original language | English |
---|---|
Article number | 033825 |
Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
Volume | 85 |
Issue number | 3 |
DOIs | |
Publication status | Published - 21 Mar 2012 |