Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 1, Pages 74-77Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.74
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We present the observation of critical coupling in a high-e fused-silica microsphere whispering-gallery mode resonator coupled to a fiber taper. Extremely efficient and controlled power transfer to high-Q, (10(7)) 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.
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