Influence of a sharp fiber tip on high-Q modes of a microsphere resonator

Götzinger, Stephan; Benson, O.; Sandoghdar, Vahid

doi:10.1364/OL.27.000080

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Influence of a sharp fiber tip on high-Q modes of a microsphere resonator

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Götzinger, S., Benson, O., & Sandoghdar, V. (2002). Influence of a sharp fiber tip on high-Q modes of a microsphere resonator. Optics Letters, 27, 80-82. doi:10.1364/OL.27.000080.

Cite as: https://hdl.handle.net/21.11116/0000-0002-9BB2-6

Abstract

We investigate the degradation of the Q factor of a fundamental whispering-gallery mode of a microsphere resonator when a fiber tip is placed in the evanescent field of the mode. With a tip diameter of 80 nm it is possible to maintain a Q factor exceeding 10(8), even when the tip is as close as 10 nm to the sphere surface. This result demonstrates the possibility of using such a tip as a "nanotool" to actively place a single nanoparticle in a single high-Q mode with great precision to achieve well-controlled coupling. (C) 2002 Optical Society of America.