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Characterizing whispering-gallery modes in microspheres by direct observation of the optical standing-wave pattern in the near field

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Knight, J., Dubreuil, N., Sandoghdar, V., Hare, J., LefevreSeguin, V., Raimond, J., et al. (1996). Characterizing whispering-gallery modes in microspheres by direct observation of the optical standing-wave pattern in the near field. Optics Letters, 21, 698-700. doi:10.1364/OL.21.000698.


Cite as: http://hdl.handle.net/21.11116/0000-0002-9BF0-0
Abstract
We demonstrated the use of a near-field probe to map the evanescent field of an optical standing wave in a fused-silica whispering-gallery mode microresonator. The periodicity of the observed standing wave allows us to estimate accurately the radial mode number of the whispering-gallery mode resonance that is being excited. We find that the use of a fiber half-coupler to excite these resonances in fused-silica microspheres results in only the lowest radial mode numbers' being strongly excited, as predicted. (C) 1996 Optical Society of America