title: Stabilization of multipole-mode solitons in mixed linear-nonlinear lattices with a PT symmetry.
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.
authors.affiliation: Institute of Information Optics, Zhejiang Normal University, Jinhua, 321004, China.
authors.forename: Changming
authors.initials: C
authors.lastname: Huang
authors.forename: Chunyan
authors.initials: C
authors.lastname: Li
authors.forename: Liangwei
authors.initials: L
authors.lastname: Dong
mesh_terms: D003198:Computer Simulation; D003460:Crystallization; D008027:Light; D016014:Linear Models; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D017711:Nonlinear Dynamics; D012542:Scattering, Radiation