Nonlinear multicore waveguiding structures with balanced gain and loss
Nonlinear multicore waveguiding structures with balanced gain and loss
We study existence, stability, and dynamics of linear and nonlinear stationary modes propagating in radially symmetric multicore waveguides with balanced gain and loss. We demonstrate that, in general, the system can be reduced to an effective $\mathcal{PT}\ensuremath{-}\text{symmetric}$ dimer with asymmetric coupling. In the linear case, we find that there exist …