Plasmonic resonances in the chain of spheroidal metallic nanoparticles on the dielectric substrate

TL;DR

This paper investigates the optical and plasmonic behavior of chains of prolate metallic spheroids on dielectric substrates, deriving relations for their resonances and analyzing how material and environment variations affect spectral properties.

Contribution

It provides new theoretical relations for the transverse polarizability and resonance frequencies of spheroid chains on substrates, expanding understanding of their spectral shifts and environmental effects.

Findings

Derived relations for transverse chain polarizability and resonance frequency.

Analyzed spectral shifts due to material and environmental changes.

Established applicability limits of the proposed theory.

Abstract

The optical and plasmonic properties of the chains of prolate metallic spheroids of the dielectric substrate are studied in the work using the local field approximation. The case when spheroids are arranged in such a way that their major semi-axis belongs to the substrate plane is considered. The relations for the transverse component of the chain polarizability tensor and the frequency of the transverse chain resonance are obtained. The comparative analysis of spectral shifts of the maxima of the imaginary part of the transverse chain polarizability and the polarizability of isolated prolate spheroid is performed. The influence of the variation of the material of particles in the chain and the dielectric environment on the location of the maxima of the imaginary part of the transverse polarizability is studied. The limits of applicability of the theory proposed in the paper are established.