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

Abstract

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.

5 pages, 3 figures

References in corpus (4)

• Robust optical delay lines via topological protection
• 1 Low power continuous-wave nonlinear optics in silica glass integrated waveguide structures
• Monolithic whispering-gallery mode resonators with vertically coupled integrated bus waveguides
• A fully integrated high-Q Whispering-Gallery Wedge Resonator

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