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We investigate one aspect of the proximity effect, viz., the local density ofstates of a superconductor-normal metal sandwich. In contrast to earlier work,we allow for the presence of an arbitrary concentration of impurities in thestructure. The superconductor induces a gap in the normal metal spectrum thatis proportional to the inverse of the elastic mean free path l_N for ratherclean systems. For a mean free path much shorter than the thickness of thenormal metal, we find a gap size proportional to l_N that approaches thebehavior predicted by the Usadel equation (diffusive limit). We also discussthe influence of interface and surface roughness, the consequences of anon-ideal transmittivity of the interface, and the dependence of our results onthe choice of the model of impurity scattering.Comment: 7 pages, 8 figures (included), submitted to PR

Excitation spectrum of mesoscopic proximity structures