Oblique incidence of semi-guided waves on rectangular slab waveguide discontinuities: A vectorial QUEP solver

Manfred Hammer

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    Abstract

    The incidence of thin-film-guided, in-plane unguided waves at oblique angles on straight discontinuities of dielectric slab waveguides, an early problem of integrated optics, is being re-considered. The 3-D frequency domain Maxwell equations reduce to a parametrized inhomogeneous vectorial problem on a 2-D computational domain, with transparent-influx boundary conditions. We propose a rigorous vectorial solver based on simultaneous expansions into polarized local slab eigenmodes along the two orthogonal cross section coordinates (quadridirectional eigenmode propagation QUEP). The quasi-analytical scheme is applicable to configurations with — in principle — arbitrary cross section geometries. Examples for a high-contrast facet of an asymmetric slab waveguide, for the lateral excitation of a channel waveguide, and for a step discontinuity between slab waveguides of different thicknesses are discussed.
    Original languageUndefined
    Pages (from-to)447-456
    Number of pages10
    JournalOptics communications
    Volume338
    DOIs
    Publication statusPublished - 1 Mar 2015

    Keywords

    • thin-film transitions
    • vectorial eigenmode expansion
    • slab waveguide discontinuities
    • waveguide facets
    • IR-92686
    • Integrated Optics
    • numerical / analyticalmodeling
    • METIS-312452
    • EWI-25287

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