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We report measurements of cavity-QED effects for the radiative coupling of atoms in a dilute vapor to the external evanescent field of a whispering-gallery mode (WGM) in a fused silica microsphere. The high Q (510^7), small mode volume (10^-8 cm^3), and unusual symmetry of the microcavity evanescent field enable velocity-selective interactions between fields with photon number of order unity in the WGM and Nₓ1 atoms in the surrounding vapor.
Vernooy et al. (Wed,) studied this question.