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.
Keywords
Cite
@article{arxiv.1110.5211,
title = {Oscillatory coupling between a monolithic whispering-gallery resonator and a buried bus waveguide},
author = {M. Ghulinyan and R. Guider and I. Carusotto and A. Pitanti and G. Pucker and L. Pavesi},
journal= {arXiv preprint arXiv:1110.5211},
year = {2016}
}
Comments
5 pages, 3 figures