Wavelength Dependence of a Vertically Coupled Resonator-Waveguide System

Year: 2016

Authors: Turri F., Ramiro-Manzano F., Carusotto I., Ghulinyan M., Pucker G., Pavesi L.

Autors Affiliation: Univ Trento, Dept Phys, Nanosci Lab, I-38123 Povo, Italy;‎ Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy;‎ Univ Trento, Dept Phys, I-38123 Povo, Italy;‎ Fdn Bruno Kessler, Ctr Mat & Microsyst, I-38123 Povo, Italy

Abstract: Coupling of light to and from a microdisk resonator is a crucial step for the integration of this photonic structure in a photonic integrated circuit. However, the most common lateral coupling scheme, based on a point contact with a coplanar bus waveguide, suffers from strong wavelength dependence. This is a limiting factor for exciting efficiently the resonantmodes in a broad spectral region. In the present paper, we propose a solution based on a different configuration, known as vertical coupling configuration, where a bus waveguide is buried below the micro disk. We demonstrate theoretically and experimentally that the long interaction region provided by this geometry allows to extend the optimal coupling spectral range from IR to visible. This feature constitutes a remarkable advantage over the usual laterally coupled devices for many different applications, such as frequency conversion, allowing bandwidth limitations to be significantly diminished.

Journal/Review: JOURNAL OF LIGHTWAVE TECHNOLOGY

Volume: 34 (23)      Pages from: 5385  to: 5390

KeyWords: All-optical devices; integrated optics devices; microcavity devices; resonators
DOI: 10.1109/JLT.2016.2615331

Citations: 5
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