title: Self-trapping of optical vortices at the surface of an induced semi-infinite photonic lattice.
abstract: We demonstrate self-trapping of singly-charged vortices at the surface of an optically induced two-dimensional photonic lattice. Under appropriate conditions of self-focusing nonlinearity, a singly-charged vortex beam can self-trap into a stable semi-infinite gap surface vortex soliton through a four-site excitation. However, a single-site excitation leads to a quasi-localized state in the first photonic gap, and our theoretical analysis illustrates that such a bandgap surface vortex soliton is always unstable. Our experimental results of stable and unstable topological surface solitons are corroborated by direct numerical simulations and linear stability analysis.
authors.affiliation: The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physical School,Nankai University, Tianjin 300457, China.
authors.forename: Daohong
authors.initials: D
authors.lastname: Song
authors.forename: Cibo
authors.initials: C
authors.lastname: Lou
authors.forename: Kody J H
authors.initials: KJ
authors.lastname: Law
authors.forename: Liqin
authors.initials: L
authors.lastname: Tang
authors.forename: Zhuoyi
authors.initials: Z
authors.lastname: Ye
authors.forename: P G
authors.initials: PG
authors.lastname: Kevrekidis
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen
mesh_terms: D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation