Abstract
We investigate the plasmonic structure of a metallic nanoparticle near a metallic thin film. We show that in the thin film limit, a virtual plasmon resonance composed of delocalized thin film plasmons is induced. We investigate how the physical properties of the virtual state depend on polarization, film thickness and nanoparticle-film separation. We show that the electromagnetic field enhancements associated with the virtual plasmon resonance are large, suggesting applications of metallic nanoparticle/thin film systems as substrates for surface enhanced spectroscopies and surface enhanced scanning probe microscopies.
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78.67.Bf; 73.20.Mf; 78.30.-j
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Nordlander, P., Le, F. Plasmonic structure and electromagnetic field enhancements in the metallic nanoparticle-film system. Appl. Phys. B 84, 35–41 (2006). https://doi.org/10.1007/s00340-006-2203-4
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DOI: https://doi.org/10.1007/s00340-006-2203-4