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Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Nanooptik

Humboldt-Universität zu Berlin | Mathematisch-Naturwissen­schaft­liche Fakultät | Institut für Physik | Nanooptik | Publications | Influence of a sharp fiber tip on high-Q modes of a microsphere resonator

Stephan Götzinger, Oliver Benson, and Vahid Sandoghdar (2002)

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

Opt. Lett., 27(2):80-82.

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 108, 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.