Dynamics of optical spatial solitons near the interface between two quadratically nonlinear media

Using the quasi-particle approach, we studied the problem of the reflection of quadratic spatial solitons from an interface between two X-(2) media with slightly different linear and nonlinear properties. The possibility of soliton capture by an interface associated with nonlinear surface wave excitation is shown. The calculations are carried out for the well-known single as well as a novel type of multihump soliton, for which we obtain a new analytical expression in the nonlocal limit for the first time to our knowledge. (C) 2002 Optical Society of America.