Abstract
We investigate the degradation of the 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 factor exceeding , 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- mode with great precision to achieve well-controlled coupling.
© 2002 Optical Society of America
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