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An efficient numerical method is developed to analyze light transmission through subwavelength apertures in metallic films, where the apertutres can have arbitrary cross sections and be surrounded by many grooves. The method is tailor-made for three-dimensional structures that are layered in different regions. It relies on field expansions in one-dimensional vertical modes, and boundary integral equations...
A new integral equation mode solver is developed for dielectric waveguides with sharp corners and high index-contrast. The method makes use of a Nyström method for discretizing integral operators with logarithmic singularities, a graded mesh technique for handling corners, and computes boundary operators for domains of constant refractive indices. The method is illustrated by a number of numerical...
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