Abstract
Different types of nonlinear surface waves with a peculiar polarization, which emerge at the interface between a photorefractive crystal and a medium with Kerr nonlinearity, are described. The cases of focusing and defocusing nonlinearity are considered. It is shown that several types of nonlinear surface waves with an asymmetric profile can exist in such a system. Waves of one type attenuate with increasing distance from the interface without oscillations towards the bulk of the photorefractive crystal as well as the Kerr crystal, while waves of another type decay with oscillations. Two types of localized states differing in the form of field damping with and without oscillations can exist near the interface between the photorefractive crystal and the medium with defocusing Kerr nonlinearity. Dispersion relations are obtained and the conditions for the existence of all aforementioned types of waves depending on the optical characteristics of the crystals are indicated. Exact solutions to dispersion equations are obtained in explicit analytic form; these solutions describe the dependence of the propagation constant on the optical characteristics of the crystals.
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Savotchenko, S.E. Nonlinear Surface Waves at the Interface between Optical Media with Different Nonlinearity Induction Mechanisms. J. Exp. Theor. Phys. 129, 159–167 (2019). https://doi.org/10.1134/S1063776119070100
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DOI: https://doi.org/10.1134/S1063776119070100