Plasmonic effects in rod-like metal-dielectric nanoparticles

TL;DR

This paper investigates the optical properties of rod-like metal-dielectric nanoparticles, analyzing how their size, shape, and material composition influence plasmonic resonances and radiation efficiency using spheroid models.

Contribution

It introduces a method to analyze optical responses of rod-like nanoparticles via equivalent spheroid models, providing insights into optimizing their shape and size for enhanced radiation efficiency.

Findings

Maxima of polarizability and cross-sections depend on size and shape.

Shape and material composition significantly influence plasmonic resonances.

Recommendations for nanoparticle design to maximize radiation efficiency.

Abstract

The optical properties of rod-like two-layer nanoparticles are studied using the notions of equivalent prolate spheroid. The calculations are presented for frequency dependencies for polarizability and the absorption and scattering cross-section of prolate spheroids, cylinders, and spherocylinders. The effect of the sizes, the shapes of the nanoparticle and the material of the core and the shell on the location of the maxima of the imaginary part of polarizability and absorption and scattering cross-sections is analysed. The recommendations regarding the shape and size ratio of the nanoparticles for obtaining the maximum value of radiation efficiency are formulated.