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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.
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Lazzari et al. (2003) studied this question.
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