Nonlocal electrodynamic modeling of frequency shifts for molecules at rough surfaces

摘要

The problem of frequency shifts for admolecules at distances very close to a metallic substrate surface protrusion is considered. The molecule is modeled as an oscillating point dipole and the morphology of the substrate is represented by a spherical island. Nonlocal electrodynamic effects are taken into account within the hydrodynamic description of the surface electrons. The results show that the nonlocal effects will tend to suppress the frequency shifts from local theory, and to create bluehyphen;shifted higherhyphen;order dispersion resonances in the frequency shift spectrum. Possible experimental observation for such effects is discussed.