Surface lattice solitons in diffusive nonlinear media

TL;DR

This paper investigates surface lattice solitons in photorefractive media with asymmetric diffusion nonlinearity, revealing their existence in finite spectral gaps and contrasting their behavior with non-lattice geometries.

Contribution

It demonstrates the existence and properties of surface lattice solitons in diffusive nonlinear media with asymmetric diffusion, highlighting differences from non-lattice surface waves.

Findings

Surface lattice solitons exist only in finite spectral gaps.

They can form even when diffusion causes beam bending away from the surface.

Contrasts with non-lattice geometries where surface waves depend on nonlinearity deflection.

Abstract

We address the properties of surface solitons supported by optical lattices imprinted in photorefractive media with asymmetric diffusion nonlinearity. Such solitons exist only in finite gaps of lattice spectrum. In contrast to latticeless geometries, where surface waves exist only when nonlinearity deflects light towards the material surface, the surface lattice solitons exist in settings where diffusion would cause beam bending against the surface.