We reveal that quadratic phase matching between plasmon modes is possible in planar waveguides.

Abstract: We analyze phase matching in metal-dielectric nonlinear structures which support highly localized plasmon polariton modes. We reveal that quadratic phase matching between the plasmon modes of different symmetries becomes possible in planar waveguide geometries. We discuss the example of a nonlinear LiNbO3 waveguide sandwiched between two silver plates, and demonstrate that second-harmonic generation can be achieved for interacting plasmonic modes.

Keywords: Nonlinear optics at surfaces; Surface plasmons

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