Scientific publications
Other affiliations: University of Buea
A. Kenfack-Jiotsa
Arnaud D Tikeng
Timoléon Crépin Kofané
Sergey V. Suchkov* (Corresponding author)
Yuri S. Kivshar
Andrey A. Sukhorukov
New Journal of Physics
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.
