The model of the composite symmetric waveguide consisting of self-focusing slab between defocusing nonlinear media separated by interfaces characterized by own nonlinearity response is proposed. Two new types of nonlinear surface waves propagating along it with anti-phase amplitude oscillations at interface planes are found. The frequencies of the nonlinear surface waves existing near the interfaces with the nonlinear response only are calculated analytically. The conditions of the surface wave existence are found. The frequencies and localization distances of the surface waves in dependence on nonlinearity waveguide parameters, slab width and interface characteristics are analyzed.

中文翻译：

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非线性表面波沿复合波导传播，该复合波导由散焦介质之间的自聚焦板组成，由具有非线性响应的界面隔开

提出了由以自身非线性响应为特征的界面分隔的散焦非线性介质之间的自聚焦平板组成的复合对称波导模型。发现了两种沿其传播的新型非线性表面波，在界面平面处具有反相位振幅振荡。仅通过解析计算存在于具有非线性响应的界面附近的非线性表面波的频率。找到了表面波存在的条件。分析了依赖于非线性波导参数、平板宽度和界面特性的表面波的频率和定位距离。