Abstract
New complex photonics structures, namely parity-time (PT)-symmetric structures, have inspired the innovative exploration of photonic structures with combined gain and loss. PT-symmetric structures are identified by their signature exceptional point (EP); operation below this point yields a completely real eigenmode/frequency, but above this point the eigen-frequencies are complex conjugates [1], [2]. Several PT-symmetric structures, such as coupled waveguides and Bragg gratings, have been studied theoretically and experimentally, and exhibit exciting behaviour and components such as unidirectional loss-induced transparency, a coherent perfect absorber laser, and a photonic analogue of a topological insulator.
© 2015 IEEE
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