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Quantum optical response of metallic nanoparticles and dimers

Abstract: The optical properties of metallic nanoparticles (NPs) can be described with analytical models based on fundamental quantum mechanical principles, of which the Drude model constitutes the classical limit. Here, we examine the plasmonic properties of silver and gold nanospheres and dimers, with radii ranging from 10 to 1 nm, extending from the classically described regime to the quantum size regime. We have studied the spectral extinction cross section by using the T-matrix method. The results indicate an increasingly substantial change in NP permittivity as the radius is reduced below 5 nm, showing a clear blueshift and weakening of the plasmon resonances for both silver and gold. As a consequence, we observe a dramatic change in the interaction of dimers, especially in the case of gold, where the introduction of quantum mechanically corrected optical properties quenches the plasmonic resonance and predicts an absence of the expected associated redshift.

 Autoría: Alcaraz De La Osa R., Sanz J., Saiz J., González F., Moreno F.,

 Fuente: Optics Letters (2012) Vol. 37, No. 23, pp. 5015-5017

 Editorial: Optical Society of America

 Fecha de publicación: 01/12/2012

 Nº de páginas: 3

 Tipo de publicación: Artículo de Revista

 DOI: 10.1364/OL.37.005015

 ISSN: 0146-9592,1539-4794,1071-2763

 Proyecto español: FIS2010-21984

 Url de la publicación: https://doi.org/10.1364/OL.37.005015

Autoría

RODRIGO ALCARAZ DE LA OSA

JUAN MARCOS SANZ CASADO