Europhys. Lett.
Volume 61, Number 4, February 2003
Page(s) 541 - 546
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 February 2003
DOI: 10.1209/epl/i2003-00163-6
Europhys. Lett., 61 (4) , pp. 541-546 (2003)

Onset of charge localisation on coupling multipolar absorption modes in supported metal particles

R. 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).

© EDP Sciences 2003