Cross Sections for Absorption and Scattering of Electromagnetic Radiation by Ensembles of Metal Nanoparticles of Different Shapes
А. В. Коротун, N. I. Pavlyshche
Abstract
Using limit transitions in the general relations for the surface relaxation and radiation damping rates in a prolate and an oblate ellipsoidal nanoparticle, the corresponding expressions for rod-shaped and disk-shaped particles are obtained. The frequency dependences of the statistically averaged efficiencies of the absorption and scattering of electromagnetic radiation by nanoparticles of different shapes are calculated. Calculations were performed for Au, Ag, Cu, and Pt nanostructures. The effect of the shape and material of the nanoparticle on the number and position of the maxima and the absorption and scattering efficiency is analyzed. It is found that the presence of two maxima in the frequency dependence of the scattering efficiency for nanodisks is associated with the manifestation of a longitudinal and transverse surface plasmon resonance.