Computational study of Plasmonic resonances in various nanogeometries

The problem of estimation of the optical response of metal nanoparticles (MNPs)--and their various geometric configurations--under the influence of external electromagnetic field is an interesting problem for the scientific community. Present work addresses this problem using a well established numerical approach in Discrete Dipole Approximation (DDA). Specifically, the approach has been utilized for studying the scattering and absorption cross-sections of MNPs when subjected to external EM field. The optical response of composite geometries such as spherical core@shell, spheroidal core@shell, homo/hetro dimer and ID chain of MNPs has been studied. The plasmonic effect of the metal nanoparticles embedded in organic medium have been analyzed to improve the solar cell performance. The work addresses the particles with the size of the order or less than that of the incident EM wavelength. An open source implementation of DDA--the DDSCAT--has been used for the same.