C Sönnichsen et al 2002 New J. Phys. 4 93 doi:10.1088/1367-2630/4/1/393
Plasmon resonances in large noble-metal clusters
Focus on Clusters at SurfacesC Sönnichsen, T Franzl, T Wilk1, G von Plessen2 and J Feldmann
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We investigate the optical properties of spherical gold and silver clusters with diameters of 20 nm and larger. The light scattering spectra of individual clusters are measured using dark-field microscopy, thus avoiding inhomogeneous broadening effects. The dipolar plasmon resonances of the clusters are found to have nearly Lorentzian line shapes. With increasing size we observe polaritonic red-shifts of the plasmon line and increased radiation damping for both gold and silver clusters. Apart from some cluster-to-cluster variations of the plasmon lines, agreement with Mie theory is reasonably good for the gold clusters. However, it is less satisfactory for the silver clusters, possibly due to cluster faceting or chemical effects.
- PACS
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71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
36.40.Mr Spectroscopy and geometrical structure of clusters
78.35.+c Brillouin and Rayleigh scattering; other light scattering
- Subjects
- Dates
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Issue 1 (November 2002)
Received 11 July 2002
Published 14 November 2002
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Plasmon resonances in large noble-metal clusters
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