We study the dynamics of off-site excitation in an optically induced waveguide lattice. A single beam centered between two waveguides leads to an asymmetric beam profile as the nonlinearity reaches a threshold. When two probe beams are launched in parallel into two nearby off-site locations, they form symmetric or antisymmetric (twisted) soliton states, depending on their relative phase. A transition of intensity pattern from on-site to off-site locations is also observed as the lattice is excited by a quasi-one-dimensional plane wave.
© 2006 Optical Society of America
Original Manuscript: September 21, 2005
Revised Manuscript: November 8, 2005
Manuscript Accepted: November 23, 2005
Cibo Lou, Jingjun Xu, Liqin Tang, Zhigang Chen, and P. G. Kevrekidis, "Symmetric and antisymmetric soliton states in two-dimensional photonic lattices," Opt. Lett. 31, 492-494 (2006)