Energy localization in photonic crystals of a purely nonlinear origin

C. Conti, S. Trillo, and G. Assanto

Phys. Rev. Lett. 85, 2502-2505 (2000)


We investigate electromagnetic localization in a {em nonlinear} photonic crystal,i.e., a structure with a stopband in its nonlinear spectral response.Taking a one-dimensional model of degenerate two-wave interaction we introduce the concept of parametric {em nonlinear-gap} solitons,that is, strongly localized two-color locked envelopes arising from interplay of two nonlinear effects. We discuss the observable signature of these novel localized structures.