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Studies of optical microresonators with dimensions between 0.1 and 10 microns are now under way in a wide variety of condensed matter systems. Ideally, one can isolate a single mode of the optical field in a cube a halfwavelength on a side with perfectly reflecting walls. Liquid droplets, polymer spheres and semiconductor Fabry-Perot microcavities with dielectric mirrors are examples of microresonators with which one can approach this ideal limit and nearly isolate a few modes of the electromagnetic field from the continuum of surrounding free-space modes.
Yamamoto et al. (Tue,) studied this question.
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