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

Manfred Hammer*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)
122 Downloads (Pure)


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 languageEnglish
Pages (from-to)447-456
Number of pages10
JournalOptics communications
Publication statusPublished - 1 Mar 2015


  • Integrated optics
  • Numerical/analytical modeling
  • Slab waveguide discontinuities
  • Thin-film transitions
  • Vectorial eigenmode expansion
  • Waveguide facets
  • n/a OA procedure

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