Journal
OPTICS COMMUNICATIONS
Volume 338, Issue -, Pages 447-456Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2014.09.087
Keywords
Integrated optics; Slab waveguide discontinuities; Thin-film transitions; Waveguide facets; Numerical/analytical modeling; Vectorial eigenmode expansion
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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 3-0 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. (C) 2014 Elsevier B.V. All rights reserved.
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