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Proceedings Paper

Microoptical device for efficient read-out of active WGM resonators
Author(s): Tobias Wienhold; Marko Brammer; Tobias Grossmann; Marc Schneider; Heinz Kalt; Timo Mappes
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Paper Abstract

Whispering-gallery mode (WGM) resonators are known to offer outstanding properties for applications in photonics and telecommunication. Despite their promising performance, one major obstacle for the use of WGM resonators in industrial products is the need of expensive components and high-precision setups for their operation, requiring a controlled lab environment. For industrial applications technically simpler and more robust realizations are desired. Active WGM resonators utilize an optical gain medium for light amplification within the resonator and may be operated as lasers. They offer several advantages over their passive counterparts, such as cheap pump sources, free space excitation of resonator modes, and potentially narrower line widths. However, collection of the light emitted from the resonator still bears several challenges. Emission occurs in plane of the resonator and radiation is emitted isotropically along the circumference. Thus, detectors positioned in plane of the resonator may collect only a limited angular segment of the resonator's light emission. We report on a microoptical device which is integrated on the resonator chip and redirects all in-plane emission of active WGM resonators into a defined off-plane direction. Redirected light can easily be collected using a standard detector. Contrary to other approaches our microoptical device does not decrease the quality factor (Q factor) of the resonator. As light from all angular segments of the resonator is collected, the detected signal-to-noise ratio is expected to be largely improved. Our microoptical device therefore offers a promising approach towards mass-producible integration of active WGM resonators, e. g. into a Lab-on-a-Chip, for sensor applications, where smallest possible frequency shifts need to be read out by a highly sensitive detector.

Paper Details

Date Published: 8 May 2012
PDF: 6 pages
Proc. SPIE 8428, Micro-Optics 2012, 842812 (8 May 2012); doi: 10.1117/12.921990
Show Author Affiliations
Tobias Wienhold, Karlsruher Institut für Technologie (Germany)
Marko Brammer, Karlsruher Institut für Technologie (Germany)
Tobias Grossmann, Karlsruher Institut für Technologie (Germany)
Marc Schneider, Karlsruher Institut für Technologie (Germany)
Heinz Kalt, Karlsruher Institut für Technologie (Germany)
Timo Mappes, Karlsruher Institut für Technologie (Germany)

Published in SPIE Proceedings Vol. 8428:
Micro-Optics 2012
Hugo Thienpont; Jürgen Mohr; Hans Zappe; Hirochika Nakajima, Editor(s)

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