We investigate the existence of spatial optical solitons supported by an interface between two nonlinear lattices with different saturation parameters. Dipole, quadrupole, and vortex solitons are found in the nonlinear surface lattices. The slight different saturation degree between two sides of the interface leads to a remarkable asymmetry of solitons with higher power. We reveal that multipole and vortex solitons are stable when their power exceeds a threshold value, and stable localized surface nonlinear modes with very high peaks are possible.
© 2010 Optical Society of America
Original Manuscript: February 17, 2010
Revised Manuscript: April 8, 2010
Manuscript Accepted: April 9, 2010
Published: May 11, 2010
Liangwei Dong and Huijun Li, "Surface solitons in nonlinear lattices," J. Opt. Soc. Am. B 27, 1179-1183 (2010)