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We propose a scheme for simultaneously trapping and detecting single atomsnear the surface of a substrate using whispering gallery modes of a microdiskresonator. For efficient atom-mode coupling the atom should be placed withinapproximately 150 nm from the disk. We show that a combination of red and bluedetuned modes can form an optical trap at such distances while the back-actionof the atom on the field modes can simultaneously be used for atom detection.We investigate these trapping potentials including van-der-Waals andCasimir-Polder forces and discuss corresponding atom detection efficiencies,depending on a variety of system parameters. Finally, we analyze thefeasibility of non-destructive detection.Comment: 13 pages, 16 figure

Simultaneous optical trapping and detection of atoms by microdisk resonators