Abstract
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 such non-conservative systems embedded into a chain of conservative waveguides.
Original language | English |
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Article number | 065005 |
Journal | New Journal of Physics |
Volume | 18 |
Issue number | 6 |
DOIs | |
Publication status | Published - Jun 2016 |