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Mapping whispering-gallery modes in microspheres with a near-field probe

Abstract : We demonstrate the use of a near-field probe to map the angular dependence of high-Q whispering-gallery modes in fused-silica microspheres. The mapping is performed by placing a micrometer-sized tip formed on the end of a monomode fiber into the evanescent field at the microsphere surface, causing light to be coupled from the microsphere resonance into the fiber guided mode. The light output of the fiber is then measured while the tip is moved to different points on the microsphere surface. We have used this method to investigate the lifting of spherical degeneracy in the system.
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https://hal-iogs.archives-ouvertes.fr/hal-01575820
Contributor : Nicolas Dubreuil <>
Submitted on : Monday, August 21, 2017 - 5:21:18 PM
Last modification on : Tuesday, October 6, 2020 - 4:26:41 PM

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J. Knight, N. Dubreuil, V. Sandoghdar, J. Hare, V. Lefèvre-Seguin, et al.. Mapping whispering-gallery modes in microspheres with a near-field probe. Optics Letters, Optical Society of America - OSA Publishing, 1995, 20 (14), pp.1515-1517. ⟨10.1364/OL.20.001515⟩. ⟨hal-01575820⟩

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