Abstract

Nonlinear surface waves localized at the interface between two media exhibit unique properties. Many nonlinear surface waves exist only above a power threshold. Recently it was predicted and experimentally observed that nonlinear self-confinement of light beams near the edge of waveguide array with focusing nonlinearity leads to the formation of discrete surface solitons for high enough input powers [1]. Such surface solitons are bound to the interface because their propagation constants belong to forbidden gaps of lattice spectrum. A spatial modulation of the lattice parameters can change the conditions of surface soliton existence dramatically since modulation modifies the band-gap lattice structure or completely destroys it [2]. In this presentation we address surface solitons that bifurcate from the fundamental linear modes supported by the interface of a uniform medium and a lattice with linearly chirped frequency.

© 2007 IEEE