Coupling of plasmonic nanoparticles to their environments in the context of van der Waals–Casimir interactions

Coupling of plasmonic nanoparticles to their environments in the context of van der Waals–Casimir interactions

We present experiments in which the interaction of a single gold nanoparticle with glass substrates or with another gold particle can be tuned by in situ control of their separations using scanning probe technology. We record the plasmon resonances of the coupled systems as a function of the polariz...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Vol. 77; no. 15; p. 9
Main Authors: Håkanson, U., Agio, M., Kühn, S., Rogobete, L., Kalkbrenner, T., Sandoghdar, V.
Format: Journal Article
Language:English
Published: 01-04-2008
Subjects:
Condensed Matter Physics
Den kondenserade materiens fysik
Fysik
Natural Sciences
Naturvetenskap
Physical Sciences
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Summary:We present experiments in which the interaction of a single gold nanoparticle with glass substrates or with another gold particle can be tuned by in situ control of their separations using scanning probe technology. We record the plasmon resonances of the coupled systems as a function of the polarization of the incident field and the particle position. The distinct spectral changes of the scattered light from the particle pair are in good agreement with the outcome of finite-difference time-domain calculations. We believe that our experimental technique holds promise for the investigation of the van der Waals-Casimir-type interactions between nanoscopic neutral bodies.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.77.155408