Optical-ï¬ber microcavities reach angstrom-scale precision Using heat and light to subtly vary the local radius and refractive index of a glass fiber is a simple and surprisingly reproducible way to create and tune a microresonator. long-standing goal of optical science is the development of devices such as miniature buï¬ers, microlasers, optical switches, and ï¬lters that can be assembled into an alloptical computerâno electrons needed. The fundamental structure required for all of those circuit elements is the microresonator, whose highly reï¬ecting walls can conï¬ne a light signal in a tiny volume for up to hundreds of microseconds. If fashioned into dielectric toroids, disks, or spheres a few tens of microns in diameter, the resonators store the light in the form of whispering-gallery modes, so called because the optical waves circulate by total internal reï¬ection around a perimeter just as acoustic waves do around the dome of Saint Paulâs Cathedral in London. The resonance condition occurs whenever the roundtrip distance is an integral number of wavelengths. The appeal of such whisperinggallery-mode resonators, particularly those made of silica, lies in their extremely high Q factor. A measure of lightâs survival time, the Q factor is the ratio of the resonance wavelength
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Optical-fiber microcavities reach angstrom-scale precision
Wilson, R. Mark
Follow Physics Today
, Volume 65 (2)
American Institute of Physics – Feb 1, 2012
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