Characterizing whispering-gallery modes in microspheres by direct observation of the optical standing-wave pattern in the near field.
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.
Knight
J C
JC
Dubreuil
N
N
Sandoghdar
V
V
Hare
J
J
Lefèvre-Seguin
V
V
Raimond
J M
JM
Haroche
S
S