Excitation mapping of whispering gallery modes in silica microcavities.
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.
Lin
G
G
Laboratoire Kastler Brossel, ENS, UPMC-Paris 6, CNRS, 24 rue Lhomond, 75005 Paris, France.
Qian
B
B
Orucević
F
F
Candela
Y
Y
Jager
J-B
JB
Cai
Z
Z
Lefèvre-Seguin
V
V
Hare
J
J