Shape sensitive Raman scattering from Nano-particles

TL;DR

This paper explores how shape variations in metal nanoparticles influence localized surface plasmon resonances and Raman signal enhancement, revealing a detectable but modest increase in scattering cross-section.

Contribution

It introduces a geometrical framework to analyze shape-dependent effects on Raman scattering in metal nanoparticles, focusing on vibrational shape changes.

Findings

Raman scattering cross-section is enhanced but remains smaller than elastic scattering.

Shape changes significantly affect localized surface plasmon resonances.

The enhancement is detectable but limited in magnitude.

Abstract

We investigate the interplay of shape changes and localized surface plasmons in small metal particles with the potential of a large enhancement of the Raman signal from the particles own vibrations. The framework is a geometrical one where we study the change in geometric factors during the vibrational movement. The resulting cross-section is found to be of a detectable order of magnitude however much smaller than the elastic cross-section.