Abstract
There has been considerable interest recently in studies of optical microresonators having dimensions between 0.1 and 10 μm.1 These microresonators can be used to fabricate very-low-threshold micro lasers or to observe interesting nonlinear-optical and molecular-photophysical effects. In particular, resonators relying on whispering-gallery-mode geometries are attractive because of the ease in obtaining high-Q cavity quality factors and in observing so-called cavity-QED phenomena.2,4 The spherical cavity is the simplest of this class of cavities, both to fabricate and to analyze.2 Gene rally, transparent droplets .5-1(10 pm in diameter are found to act as natural resonators.
© 1994 Optical Society of America
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