Oscillatory coupling between a monolithic whispering-gallery resonator and a buried bus waveguide

Details Oscillatory coupling between a monolithic whispering-gallery resonator and a buried bus waveguide Oscillatory coupling between a monolithic whispering-gallery resonator and a buried bus waveguide

2011-10-24

arxiv.org/abs/1110.5211v1

Physics

Optics

5 pages, 3 figures

Scientific paper

We report on a combined theoretical and experimental study of the optical coupling between a microdisk resonator and a waveguide laying on ?different planes. While the lateral coupling between a planar resonator and a waveguide is characterized by a unique distance at which the resonant waveguide transmission vanishes because of destructive interference, the vertical coupling geometry exhibits an oscillatory behavior in the coupling amplitude as a function of the vertical gap. This effect manifests experimentally as oscillations in both the waveguide transmission and the mode quality factor. An analytical description based on coupled-mode theory and a two-port beam-splitter model of the waveguide-resonator coupling is developed, which compares successfully both to experimental data and numerical simulations.

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