1.
Opt Lett
; 39(14): 4215-8, 2014 Jul 15.
Artículo
en Inglés
| MEDLINE
| ID: mdl-25121690
RESUMEN
It is shown that asymmetric waveguides with gain and loss can support a stable propagation of optical beams. This means that the propagation constants of modes of the corresponding complex optical potential are real. A class of such waveguides is found from a relation between two spectral problems. A particular example of an asymmetric waveguide, described by the hyperbolic functions, is analyzed. The existence and stability of linear modes and of continuous families of nonlinear modes are demonstrated.