# On the electromagnetic resonances of nanoparticles

## TL;DR

This paper presents a spectral technique to analyze electromagnetic resonances in nanoparticles, clarifying mode contributions and differences between dielectric and metal spheres, with applications to silicon and silver nanospheres.

## Contribution

It introduces a spectral method for unambiguously identifying resonance modes in nanoparticle scattering spectra, highlighting differences between dielectric and metallic particles.

## Key findings

- Spectral technique effectively identifies resonance modes.
- Differences in scattering properties between dielectric and metal spheres.
- Application to silicon and silver nanospheres demonstrates method utility.

## Abstract

A spectral technique is applied to evaluate the resonance frequencies of the full retarded scattering from spherical nanoparticles. This approach allows one to unambiguously identify the modes that are responsible of both the peaks and the asymmetric lineshapes of the scattered power spectra. The fundamental differences between the electromagnetic scattering properties of dielectric and metal spheres are discussed. These results are used to investigate the scattering from isolated silicon and silver nanospheres.