Abstract
The resonance frequency of an electric dipole placed near a conducting surface is shifted by the dipole-surface interaction. This Letter reports the observation and measurement of these shifts at optical frequencies for an experimental system that consists of a metal island film spaced a distance $d$ from a continuous Ag film. The dependence of the shift in the frequency of the island resonance on $d$ shows good agreement with that predicted by a classical theory of the dipole-surface interaction.
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