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arXiv · 1110.5211

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

M. Ghulinyan·R. Guider·I. Carusotto·A. Pitanti·G. Pucker·L. Pavesi
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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.

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M. Ghulinyan, R. Guider, I. Carusotto, A. Pitanti, G. Pucker, L. Pavesi. 2011-10-24. Oscillatory coupling between a monolithic whispering-gallery resonator and a buried bus waveguide. https://doi.org/10.1103/physrevlett.110.163901

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