1 December 2007 Design of microcavity resonators for single-atom detection
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Whispering gallery modes of a microdisk resonator are useful for the optical detection of single rubidium and cesium atoms near the surface of a substrate. Light is coupled into two high-Q whispering-gallery modes of the disk which can provide attractive and/or repulsive potentials, respectively, via their evanescent fields. The sum potential, including van der Waals/Casimir-Polder surface forces, may be tuned to exhibit a minimum at distances on the order of 100 nm from the disk surface. Simultaneously optically trapping and detecting is possible, with the back-action of an atom held in this trap on the light fields being suffciently strong to provide a measurable effect. Atom trapping and detection depend on a variety of system parameters and experimental realizations differ for different atoms.
Michael Rosenblit, Peter Horak, Eyal Fleminger, Yonathan Japha, Ron Folman, "Design of microcavity resonators for single-atom detection," Journal of Nanophotonics 1(1), 011670 (1 December 2007). https://doi.org/10.1117/1.2835450

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