Observation of Critical Coupling in a Fiber Taper to a Silica-Microsphere Whispering-Gallery Mode System

Ming Cai, Oskar Painter, and Kerry J. Vahala
Phys. Rev. Lett. 85, 74 – Published 3 July 2000
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Abstract

We present the observation of critical coupling in a high- Q fused-silica microsphere whispering-gallery mode resonator coupled to a fiber taper. Extremely efficient and controlled power transfer to high- Q (107) resonators has been demonstrated. Off-resonance scattering loss was measured to be less than 0.3%. On-resonance extinction in transmitted optical power through the fiber coupler was measured as high as 26 dB at the critical coupling point. This result opens up a range of new applications in fields as diverse as near-field sensing and quantum optics.

  • Received 17 December 1999

DOI:https://doi.org/10.1103/PhysRevLett.85.74

©2000 American Physical Society

Authors & Affiliations

Ming Cai, Oskar Painter, and Kerry J. Vahala*

  • Department of Applied Physics, California Institute of Technology, Pasadena, California 91125

  • *Electronic address: vahala@its.caltech.edu; URL: http://www.cco.caltech.edu/~aphhome/vahala.html

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Vol. 85, Iss. 1 — 3 July 2000

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