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Radiative corrections to an atom are calculated near a half-space that hasarbitrarily-shaped small depositions upon its surface. The method is based oncalculation of the classical Green's function of the macroscopic Maxwellequations near an arbitrarily perturbed half-space using a Born seriesexpansion about the bare half-space Green's function. The formalism ofmacroscopic quantum electrodynamics is used to carry this over into the quantumpicture. The broad utility of the calculated Green's function is demonstratedby using it to calculate two quantities --- the spontaneous decay rate of anatom near a sharp surface feature, and the Casimir-Polder potential of a finitegrating deposited on a substrate. Qualitatively new behaviour is found in bothcases, most notably in the latter where it is observed that the periodicity ofthe Casimir-Polder potential persists even outside the immediate vicinity ofthe grating.

Spontaneous decay rate and Casimir-Polder potential of an atom near a lithographed surface