NONLINEAR WAVES IN AN ASYMMETRIC LAYERED WAVEGUIDE CONTAINING A LINEARLY GRADED-INDEX MEDIUM AND KERR NONLINEAR MEDIUM SEPARATED BY OPTICALLY LINEAR SLAB

The nonlinear surface waves propagating along a layered waveguide structure containing a linearly graded-index medium and Kerr nonlinear medium separated by optically linear slab are described theoretically. A model of such waveguide and the wave equation with composite dielectric constant depending on the spatial distance and light intensity in the corresponding layers are formulated. The exact solutions to the wave equation describing new types of surface waves are calculated. The four types of the waves obtained differ from each other by the presence of oscillations of the field profile transverse to the layers and a nonlinearity sign. Dependencies of the interface amplitude on the effective refractive index, slab width, and width of the graded-index layer are analyzed.