Optical properties of gold metal clusters: A time-dependent local-density-approximation investigation View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1998-10

AUTHORS

J. Lermé, B. Palpant, B. Prével, E. Cottancin, M. Pellarin, M. Treilleux, J.L. Vialle, A. Perez, M. Broyer

ABSTRACT

The optical response of free and matrix-embedded gold metal clusters AuN is investigated in the framework of the time-dependent local-density-approximation (TDLDA). The characteristics of the surface plasmon resonance are carefully analyzed as a function of the model parameters and the particle radius. The strong influence of the frequency-dependence of the 5d core-electron dielectric function in the vicinity of the interband threshold is emphasized. The size evolution of the Mie-frequency in free gold clusters exhibits a noticeable blue-shift trend as the particle size decreases, much stronger than in silver clusters. The width and shape of the resonance, essentially ruled by the decay via the interband transitions, are found closely correlated to the imaginary component of the core-electron dielectric function. In presence of a surrounding matrix the blue-shift trend is largely rubbed out. Agreement with recent experimental results on size-selected gold clusters embedded in an alumina matrix may be achieved by taking into account the porosity effects at the metal/matrix interface. The comparison with the predictions of classical models is also provided. More... »

PAGES

95-108

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s100530050189

DOI

http://dx.doi.org/10.1007/s100530050189

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1049455127


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