  We propose a scheme for simultaneously trapping and detecting single atoms
near the surface of a substrate using whispering gallery modes of a microdisk
resonator. For efficient atom-mode coupling the atom should be placed within
approximately 150 nm from the disk. We show that a combination of red and blue
detuned modes can form an optical trap at such distances while the back-action
of the atom on the field modes can simultaneously be used for atom detection.
We investigate these trapping potentials including van-der-Waals and
Casimir-Polder forces and discuss corresponding atom detection efficiencies,
depending on a variety of system parameters. Finally, we analyze the
feasibility of non-destructive detection.
