Sánchez-Curto, J, Chamorro-Posada, P and McDonald, GS 2009, 'Nonlinear interfaces: intrinsically nonparaxial regimes and effects' , Journal of Optics A: Pure and Applied Optics, 11 (5) , 054015.

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Abstract

The behaviour of optical solitons at planar nonlinear boundaries is a problem rich in intrinsically nonparaxial regimes that cannot be fully addressed by theories based on the nonlinear Schrödinger equation. For instance, large propagation angles are typically involved in external refraction at interfaces. Using a recently proposed generalized Snell's law for Helmholtz solitons, we analyse two such effects: nonlinear external refraction and total internal reflection at interfaces where internal and external refraction, respectively, would be found in the absence of nonlinearity. The solutions obtained from the full numerical integration of the nonlinear Helmholtz equation show excellent agreement with the theoretical predictions.

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