Total multimode reflection at facets of planar high- contrast optical waveguides

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    Abstract

    Based on rigorous mode expansion simulations, we consider the problem of guided light reflection at rectangular end facets of planar dielectric waveguides. Emphasis is on multimode structures with high refractive index contrast and on configurations that show a high reflectivity. Given the matrix of reflection coefficients for the guided fields, one can compute the maximum power reflectance for an incident mode superposition. While even for a substantial refractive index contrast across the facet the maximum reflected power for a single incoming mode is always moderate, the reflectivity may rise to a level that justifies the attribute total if one considers specific superpositions of at least two guided modes. The paper shows the results of numerical experiments for two series of symmetrical and nonsymmetrical waveguides and identifies conditions on the facet geometry and the exciting field, which are prerequisites for the full reflection effect.
    Original languageUndefined
    Pages (from-to)1549-1555
    Number of pages7
    JournalJournal of lightwave technology
    Volume20
    Issue number8
    DOIs
    Publication statusPublished - Aug 2002

    Keywords

    • total reflection
    • microresonator cavities
    • Dielectric waveguide facet
    • IR-44132
    • Integrated Optics
    • Numerical modeling
    • METIS-208487
    • EWI-13966

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