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

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

1998-05-23

arxiv.org/abs/physics/9805030v1

Physics

Optics

14 pages, 4 figures

Scientific paper

10.1364/JOSAB.16.000147

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.

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