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We study the nonlinear waves propagating in metal slot waveguides with aKerr-type dielectric core. We develop two independent semi-analytical models todescribe the properties of such waveguides. Using those models we compute thedispersion curves for the first ten modes of a nonlinear slot waveguide. Forsymmetric waveguides we find symmetric, antisymmetric, and asymmetric modeswhich are grouped in two families. In addition, we study the influence of theslot width on the first symmetric and asymmetric modes, and we show that thedispersion curve of the first asymmetric mode is invariant with respect to theslot width for high propagation constant values and we provide analyticalapproximations of this curve.

Symmetric metal slot waveguides with nonlinear dielectric core: bifurcations, size effects, and higher order modes