Enhancement of second-harmonic field and nonlinear dispersion via a composite of elliptical cylinder nanoparticles

Abstract

This work is a numerical description of the interaction between optical pulses and plasmonic oscillations in nanoparticle composites. We present a numerical demonstration of enhanced second-harmonic generation (SHG) in plasmonic nanoparticles caused by collective resonances. The SHG and dispersion associated with core–shell nanoparticles are studied based on the Drude model. The shape of nanoparticles and the SHG enhancement factor are closely intertwined. It is shown that shape effects can be applied to enhance the SHG from plasmonic nanoshells and also the absorption and dispersion of a nonlinear dielectric function of the recommended structure are evaluated. At metal–dielectric interfaces, it has been demonstrated that the association of plasmonic nanostructures with nonlinear dielectric systems provides useful platforms for boosting frequency conversion processes. In addition, examining the effect of various geometrical parameters on the slow-light factor reveals a reduction in the slow-light spectrum, laying the groundwork for optical pulse storage and retrieval in optical communication applications in the future. This core–shell nanoparticle structure is attractive for a wide range of applications, including optical communication devices, due to the mentioned unique optical properties.