We report on plasmonic waveguides made of a thin metal stripe surrounded on one or both sides by a Kerr nonlinear medium. Using an iterative numerical method, we investigate the stationary long-range plasmons that exist for self-focusing and self-defocusing Kerr-type nonlinearities. The solutions are similar to the well-known case of infinitely wide nonlinear waveguides---they are strongly power-dependent and can experience symmetry-breaking bifurcations under appropriate conditions.
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Degiron et al. (2010) studied this question.
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