Analytical and numerical modeling of passive and active coated nanoparticles

A variety of open and closed nanoparticle structures have been considered analytically and numerically. These include multi-layered structures based on dielectrics and metals excited by plane waves and electric Hertzian dipoles at optical frequencies. Both passive and active (gain impregnated dielectric) materials have been considered. Enhanced and mitigated scattering effects have been modeled. Nano-antenna and nano-amplifier configurations for optical applications have been emphasized. A review of these modeling efforts will be presented.