Journal
OPTICS LETTERS
Volume 35, Issue 4, Pages 583-585Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.35.000583
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- C'Nano-Ile de France
- French embassy in Beijing
- Chinese Scholarship Council
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We report the direct observation of the electromagnetic-field distribution of whispering gallery modes in silica microcavities ( spheres and toroids). It is revealed by their excitation efficiency with a tapered fiber coupler swept along the meridian. The originality of this method lies in the use of the coupler itself for the near-field mapping, eliminating the need of additional tools used in previous work. This method is successfully applied to microspheres and microtoroids. (C) 2010 Optical Society of America
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