Oscillatory Vertical Coupling between a Whispering-Gallery Resonator and a Bus Waveguide

Year: 2013

Authors: Ghulinyan M., Ramiro-Manzano F., Prljaga N., Guider R., Carusotto I., Pitanti A., Pucker G., Pavesi L.

Autors Affiliation: Advanced Photonics and Photovoltaics Unit, Fondazione Bruno Kessler, I-38123 Povo, Italy; Department of Physics, Nanoscience Laboratory, University of Trento, I-38123 Povo, Italy; INO-CNR BEC Center and Department of Physics, University of Trento, I-38123 Povo, Italy; NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR, Piazza San Silvestro 12, 56127 Pisa, Italy

Abstract: We report on a theoretical and experimental study of the optical coupling between a whispering-gallery type resonator and a waveguide lying on different planes. In contrast to the usual in-plane geometry, the present vertical one is characterized by an oscillatory behavior of the effective coupling as a function of the vertical gap. This behavior manifests itself as oscillations in both the resonance peak 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 vertical coupling is developed for arbitrary phase-matching conditions and is successfully used to interpret the experimental observations. DOI: 10.1103/PhysRevLett.110.163901


Volume: 110 (16)      Pages from: 163901  to: 163901

More Information: The authors thank M. R. Vanacharla for stimulating discussions, and MTLab-FBK staff for the support in realizing samples. This work has been supported by NAoMI-FUPAT. F. R. M. thanks the project APPCOPTOR financed through an FP7 EU Marie Curie fellowship.
DOI: 10.1103/PhysRevLett.110.163901

Citations: 39
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