Europhys. Lett., 61 (4) , pp. 541-546 (2003)
Onset of charge localisation on coupling multipolar absorption modes in supported metal particlesR. Lazzari1, 2, I. Simonsen1, 3 and J. Jupille1
1 Laboratoire CNRS/Saint-Gobain "Surface du Verre et Interfaces" F-93303 Aubervilliers, France
2 CEA Grenoble, DRFMC/SP2M/IRS - F-38054 Grenoble, France
3 Department of Physics, The Norwegian University of Science and Technology N-7034 Trondheim, Norway
(Received 13 November 2001; accepted in final form 2 December 2002)
An experimental evidence of the local enhancement of the electric field on supported metal nanoparticles is given in the case of a silver thin film growing on alumina, as studied in situ by surface differential reflectance. The dynamic charge localisation is driven by the inter-particle coupling of the multipolar plasmon absorption modes. Those modes and the associated polarisation charges are assigned via the modeling of the optical response.
78.20.Bh - Theory, models, and numerical simulation.
61.46.+w - Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals.
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
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