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Non-Hermitian trimers: PT-symmetry versus pseudo-Hermiticity

Suchkov, Sergey V; Fotsa-Ngaffo, Fernande; Kenfack-Jiotsa, Aurelien; Tikeng, Arnaud D; Kofane, Timoleon C; Kivshar, Yuri; Sukhorukov, Andrey A

Description

We study a structure composed of three coupled waveguides with gain and loss, a non-Hermitian trimer. We demonstrate that the mode spectrum can be entirely real if the waveguides are placed in a special order and at certain distances between each other. Such structures generally lack a spatial symmetry, in contrast to parity-time symmetric trimers which are known to feature a real spectrum. We also determine a threshold for wave amplification and analyse the scattering properties of...[Show more]

CollectionsANU Research Publications
Date published: 2016-06-13
Type: Journal article
URI: http://hdl.handle.net/1885/109268
Source: New Journal of Physics
DOI: 10.1088/1367-2630/18/6/065005

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