On Surface Plasmon Spectrum in Noble Metal Nanoparticles - Rods and Spheroids

TL;DR

This paper presents a theoretical analysis of surface plasmon spectra in noble metal nanoparticles like rods and spheroids, highlighting the role of electrons and establishing a linear relationship between resonance wavelengths and particle aspect ratios.

Contribution

A simple model for surface plasmons in nanorods is developed, demonstrating linear dependence of resonance wavelengths on aspect ratios and validating results with experimental data.

Findings

Surface plasmon resonance wavelengths are linearly dependent on particle aspect ratios.

Theoretical results show excellent agreement with experimental data for gold and silver nanoparticles.

Electrons play a crucial role in the formation of surface plasmon resonances.

Abstract

The surface plasmon oscillations spectra in noble metal nanoparticles - rods and spheroids embedded in a host matrix is analyzed theoretically. The important role of - electrons in formation of surface plasmon resonances is shown. A simple model is developed to describe the surface plasmons in nanorods. It is shown, that both for nanorods and spheroids the surface plasmon resonance wavelengths are linearly dependent on aspect ratios of these particles. The results of calculations are compared with experimental data for gold and silver particles and excellent agreement is demonstrated.