The modified propagation equation for TM polarized subwavelength spatial solitons in a nonlinear planar waveguide

Abstract

The wave equation of TM polarized subwavelength beam propagations in a nonlinear planar waveguide is derived beyond the paraxial approximation. This modified equation contains more higher-order linear and nonlinear terms than the nonlinear Schrodinger equation. The propagation of fundamental subwavelength spatial solitons is numerically studied. It is shown that the effect of the higher nonlinear terms is significant. That is, for the propagation of narrower beam the modified nonlinear Schrodinger equation is more suitable than the nonlinear Schrodinger equation. (c) 2006 Elsevier GmbH. All rights reserved.