Oscillatory behavior and enhancement of the surface plasmon linewidth in embedded noble metal nanoparticles
Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504, CNRS-ULP) ,
23 rue du Loess, 67037 Strasbourg
Corresponding author: a email@example.com
Published online: 3 July 2003
We study the Landau damping of the surface plasmon resonance of metallic nanoparticles embedded in different environments of experimental relevance. Important oscillations of the plasmon linewidth as a function of the radius of the nanoparticles are obtained from numerical calculations based on the time dependent local density approximation. These size-oscillations are understood, within a semiclassical approximation, as a consequence of correlations in the spectral density of the nanoparticles. We treat inert matrices, as well as the case with an unoccupied conduction band. In the latter case, the plasmon lifetime is greatly reduced with respect to the inert case, but the non-monotonous size-dependence persists.
PACS: 71.45.Gm – Exchange, correlation, dielectric and magnetic response functions, plasmons / 31.15.Gy – Semiclassical methods / 36.40.Vz – Optical properties of clusters
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003