Analysis of the Influence of Longitudinal Fields on the Scattering Properties of Nonspherical Plasmonic Nanoparticle Clusters via the Discrete-Sources Method

Abstract

We consider the problem of diffraction of a plane electromagnetic wave field at a linear cluster consisting of two plasmonic nanoparticles while accounting for the nonlocal effect. The research is based on the mathematical model of the generalized non-local optical response. On the basis of the modification of the discrete sources method, a comparative numerical analysis of the scattering characteristics in the frequency domain is carried out depending on the geometry of the particles and the distance between them. It has been established that taking longitudinal fields into account has a significant influence on the extinction cross section and even more on the scattering cross section.