Self-trapping of optical vortices at the surface of an induced semi-infinite photonic lattice.
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.
Song
Daohong
D
The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physical School,Nankai University, Tianjin 300457, China.
Lou
Cibo
C
Law
Kody J H
KJ
Tang
Liqin
L
Ye
Zhuoyi
Z
Kevrekidis
P G
PG
Xu
Jingjun
J
Chen
Zhigang
Z
D003198:Computer Simulation; D008027:Light; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation