Models of waveguides combining gradient and nonlinear optical layers

Objectives . Theoretical studies of the waveguide properties interfaces between nonlinear optical and graded-index media are important for application in optoelectronics. Waveguides combining layers with different seem to be most promising, since they can matched optimal characteristics using a wide range control parameters. The paper aims develop theory composite optically gradedindex waveguides an arbitrary profile, within which it is possible obtain exact analytical expressions surface waves modes explicit form. main feature proposed this its applicability describing modes, field concentrated inside gradient layer does not exceed boundary, avoiding contact layer. Methods Analytical methods optics used. Results A theoretical description interface two having significantly carried out. formulated model plane applicable spatial permittivity profile. An expression wave propagating along medium stepwise nonlinearity profile obtained. Additionally, Kerr (both self-focusing defocusing), as well characterized by exponential linear profiles, Conclusions supports visual form narrowly localized light beam such waveguides. It shown that semiconductor crystals waveguide, on one side dielectric other.