Single and double ultrashort laser pulse scattering by spheroidal metallic nanoparticles

TL;DR

This paper develops a kinetic theory for ultrashort laser pulse scattering by spheroidal metallic nanoparticles, analyzing shape, frequency, and pulse effects, and compares it with Mie theory, including double pulse interactions.

Contribution

It introduces a kinetic approach to model ultrashort pulse scattering by spheroidal nanoparticles, highlighting differences from Mie theory and effects of particle shape and double pulses.

Findings

Scattering cross-section depends on particle shape and pulse parameters.

Energy scattering exhibits oscillations with pulse delay in double pulse interactions.

Surface contributions are significant when particle size approaches electron mean free path.

Abstract

The theory of the ultrashort laser pulse scattered by metallic nanoparticles in the region of surface plasmon resonances is developed in the framework of kinetic approach. For the spheroidal particles, the dependence of the light scattering cross-section on the shape of the particles, the carrier wave frequency, a pulse duration, and other factors is studied. Additionally, an interaction of small metallic particles with double ultrashort pulse is considered. In this case, the energy scattered by the particles demonstrates oscillating behavior when the time delay between pulses changes. Special attention is paid to the contribution of the particle's surface when the particle's size is close to the length of free electron path. The difference between the kinetic approach and Mie theory for non-spherical particles has been shown.