Plasmon resonances in large noble-metal clusters

Details Plasmon resonances in large noble-metal clusters Plasmon resonances in large noble-metal clusters

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002njph....4...93s&link_type=abstract

New Journal of Physics, Volume 4, Issue 1, pp. 93 (2002).

Physics

29

Scientific paper

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.

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