Evanescent and refractive side-coupled high-Q resonances of noncircular 2D micropillars

Andrew W. Poon; Francois Courvoisier; Richard K. Chang

doi:10.1117/12.424664

24 April 2001 Evanescent and refractive side-coupled high-Q resonances of noncircular 2D micropillars

Andrew W. Poon, Francois Courvoisier, Richard K. Chang

Proceedings Volume 4270, Laser Resonators IV; (2001) https://doi.org/10.1117/12.424664
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

Side-coupling between 2-D micropillars and waveguides that allows a gap spacing larger than the sub-micron range would open opportunities for integrated photonic devices. Two microcavity designs, square and oval, were investigated. The square allows longer interaction length and the oval allows refractive coupling thus larger gap spacing. In the elastic scattering of ? 210-micron square microcavity in fused silica, multi-mode cavity resonances were imaged from the square sidewall. Based on a two-dimensional k-space representation, we accounted for the multi modes by different normal modes with trajectories confined by total internal reflection. The cavity-mode trajectories need not be closed after each round trip. In oval microcavities, the ray trajectories are typically irregular. Light rays that are initially confined by total internal reflection could subsequently escape by refraction (according to Snell’s law) in the vicinity of the higher-curvature region. Periodic filter spectrum in the elastic scattering of oval microcavity was observed in specific input and output coupling directions in the far-field. We interpreted the filter spectrum as the multiple-ray interference of the refractively outputcoupled cavity modes at the detector.

Citation Download Citation

Andrew W. Poon, Francois Courvoisier, and Richard K. Chang "Evanescent and refractive side-coupled high-Q resonances of noncircular 2D micropillars", Proc. SPIE 4270, Laser Resonators IV, (24 April 2001); https://doi.org/10.1117/12.424664

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