Surface response of spherical core-shell structured nanoparticle by optically induced elastic oscillations of soft shell against hard core

TL;DR

This paper investigates the optically induced elastic oscillations of a spherical core-shell nanoparticle, deriving eigenfrequencies for vibrational modes relevant to resonant scattering of electromagnetic waves.

Contribution

It introduces a model for elastic vibrations of core-shell nanoparticles and calculates eigenfrequencies for specific vibrational modes, aiding spectral analysis.

Findings

Eigenfrequencies for spheroidal and torsional modes are derived.

The vibrational modes are characterized for particles with a soft shell and hard core.

Results are relevant for interpreting resonant scattering spectra.

Abstract

The optically induced oscillatory response of a spherical two-component, shell-core structured, nanoparticle by nodeless elastic vibrations of soft peripheral shell against hard and dynamically immobile inner core is considered. The eigenfrequencies of the even-parity, spheroidal and odd-parity torsional vibrational modes trapped in the finite-depth shell are obtained which are of practical interest for modal specification of individual resonances in spectra of resonant scattering of long wavelength electromagnetic waves by ultrafine particles.