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Stabilization of multipole-mode solitons in mixed linear-nonlinear lattices with a PT symmetry
Changming Huang1, Chunyan Li, Liangwei Dong
1Institute of Information Optics, Zhejiang Normal University, Jinhua, 321004, China.
Abstract:
We report the evolution of higher-order nonlinear states in a focusing cubic medium, where both the linear refractive index and the nonlinearity are spatially modulated by a complex optical lattice exhibiting a parity-time (PT) symmetry. We reveal that introduction of out-of-phase nonlinearity modulation makes possible the stabilization of higher-order solitons with number of poles up to 7, which are highly unstable in linear PT lattices. Under appropriate conditions, multipole-mode solitons with out-of-phase components in the neighboring lattice sites are completely stable provided that their power or propagation constant exceeds a critical value. Thus, our findings suggest an effective way for the realization of stable multipole-mode solitons in periodic potentials with gain-loss components.
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