Finite element and perturbative study of buffered leaky planar waveguides

H.P. Uranus, Hugo Hoekstra, Embrecht W.C. van Groesen

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    The effects of the presence of a high-index medium in the proximity of planar waveguiding structures that makes up buffered leaky waveguides, were studied using a finite element method (FEM) leaky mode solver and a perturbation method. Various phenomena observed in the FEM results were interpreted through the approximate analytical expressions derived using the perturbation method. The effect of the buffer layer thickness, the high-index medium refractive index, and the quasi-confinement of the modal field were investigated. The results show that the perturbation due to the high-index medium can lead to either an increase or a decrease of the real part of the effective index, and that the leakage loss of a TE-polarized mode is not always lower than TM-polarized mode of the same order. It was found that if the refractive index of the high-index medium goes to infinity, a leaky-wave structure evolves into a guided-wave structure.
    Original languageUndefined
    Pages (from-to)99-108
    Number of pages10
    JournalOptics communications
    Issue number1-3
    Publication statusPublished - 2005


    • IR-52717
    • METIS-224426
    • EWI-11549

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