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Symmetric Plasmonic Slot Waveguides with a Nonlinear Dielectric Core: Bifurcations, Size Effects, and Higher Order Modes

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Abstract

We study the nonlinear stationary waves propagating in metal slot waveguides with a Kerr-type dielectric core. We develop two independent semianalytical models to describe these waves in such waveguides. Using these models, we compute the dispersion curves for about ten first modes of a nonlinear slot waveguide. For symmetric wave- guides, we find symmetric, antisymmetric, and asymmetric higher order modes which are grouped in two families. In addition, we study the influence of the slot width on the first symmetric and asymmetric modes. We also show that the dispersion curve of the first asymmetric mode is invariant with respect to the slot width for high propagation constant values and we provide analytical approximations of this curve. Using realistic values for the optogeometric parameters of the structure, we are able to obtain the bifurcation at a realistic power.

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Acknowledgments

This work was supported by the European Commission through the Erasmus Mundus Joint Doctorate Programme Europhotonics (Grant No. 159224-1-2009-1-FR-ERA MUNDUS-EMJD). The authors thank Y.V. Kartashov for helpful comments on this work. G.R. thanks J.-M. Fédéli for fruitful discussions.

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Authors and Affiliations

  1. Aix–Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, 13013, Marseille, France

    Wiktor Walasik & Gilles Renversez

  2. ICFO—Institut de Ciències Fotòniques, Universitat Politècnica de Catalunya, 08860, Castelldefels, Barcelona, Spain

    Wiktor Walasik

  3. Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

    Alejandro Rodriguez

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  1. Wiktor Walasik
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  2. Alejandro Rodriguez
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  3. Gilles Renversez
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Correspondence to Gilles Renversez.

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Walasik, W., Rodriguez, A. & Renversez, G. Symmetric Plasmonic Slot Waveguides with a Nonlinear Dielectric Core: Bifurcations, Size Effects, and Higher Order Modes. Plasmonics 10, 33–38 (2015). https://doi.org/10.1007/s11468-014-9773-5

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  • DOI: https://doi.org/10.1007/s11468-014-9773-5

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