Nonlinear wave propagation along a bent nonlinear dielectric interface

Abstract

The transmission properties of abruptly and uniformly bent nonlinear interfaces are investigated by using the beam-propagation method. An approximate analytical solution of the threshold power for the straight interface is also derived. It is found that the incident surface wave can propagate along the interface bent toward a nonlinear medium, whereas it cannot propagate along that bent toward a linear medium. The bent interface can be used as a lower-threshold device and for an experimental verification of the nonlinear surface wave along a single interface. Moreover the results given here are useful for the design of all-optical waveguide devices that contain bends and tapers, since the nonlinear surface wave can propagate in many nonlinear waveguides.