Distance-dependent plasmon resonant coupling between a gold nanoparticle and gold film

TitleDistance-dependent plasmon resonant coupling between a gold nanoparticle and gold film
Publication TypeJournal Article
Year of Publication2008
AuthorsJ.J. Mock, R..T. Hill, A.. Degiron, S.. Zauscher, A.. Chilkoti, D.R. Smith
JournalNano Letters
Volume8
Issue8
Pagination2245-2252
ISBN Number1530-6984
Accession NumberWOS:000258440700023
Abstract

We present an experimental analysis of the plasmonic scattering properties of gold nanoparticles controllably placed nanometers away from a gold metal film. We show that the spectral response of this system results from the interplay between the localized plasmon resonance of the nanoparticle and the surface plasmon polaritons of the gold film, as previously predicted by theoretical studies. In addition, we report that the metal film induces a polarization to the single nanoparticle light scattering, resulting in a doughnut-shaped point spread function when imaged in the far-field. Both the spectral response and the polarization effects are highly sensitive to the nanoparticle-film separation distance. Such a system shows promise in potential biometrology and diagnostic devices.