Optical microsphere resonators: optimal coupling to high-Q whispering gallery modes

A general model is presented for coupling of high-\(Q\) whispering-gallery modes in optical microsphere resonators with coupler devices possessing discrete and continuous spectrum of propagating modes. By contrast to conventional high-Q optical cavities, in microspheres independence of high intrinsi...

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Bibliographic Details
Published in:arXiv.org 1998-05
Main Authors: Gorodetsky, Michael L, Ilchenko, Vladimir S
Format: Article
Language:English
Subjects:
Couplers
Coupling
Fused silica
Microspheres
Propagation modes
Resonators
Silicon dioxide
Whispering gallery modes
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Summary:A general model is presented for coupling of high-\(Q\) whispering-gallery modes in optical microsphere resonators with coupler devices possessing discrete and continuous spectrum of propagating modes. By contrast to conventional high-Q optical cavities, in microspheres independence of high intrinsic quality-factor and controllable parameters of coupling via evanescent field offer variety of regimes earlier available in RF devices. The theory is applied to the earlier-reported data on different types of couplers to microsphere resonators and complemented by experimental demonstration of enhanced coupling efficiency (about 80%) and variable loading regimes with Q>10^8 fused silica microspheres.
ISSN:2331-8422
DOI:10.48550/arxiv.9805030