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.
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Islamic Azad Univ, Sci & Res Branch, Dept Elect Engn, Tehran 1477893855, IranIslamic Azad Univ, Sci & Res Branch, Dept Elect Engn, Tehran 1477893855, Iran
Heshmati, Sajjad
Abedi, Kambiz
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Shahid Beheshti Univ, Fac Elect Engn, Tehran, IranIslamic Azad Univ, Sci & Res Branch, Dept Elect Engn, Tehran 1477893855, Iran
Abedi, Kambiz
Darvish, Ghafar
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Islamic Azad Univ, Sci & Res Branch, Dept Elect Engn, Tehran 1477893855, IranIslamic Azad Univ, Sci & Res Branch, Dept Elect Engn, Tehran 1477893855, Iran