Theory for absorption of ultrashort laser pulses by spheroidal metallic nanoparticles

Abstract

The theory for the electric and magnetic fields energy absorption by small metallic particles subjected to the irradiation by ultrashort laser pulses of different duration in the region of surface plasmon excitation is developed. For the particles of the oblate or prolate spheroidal shape there has been found the dependence of the absorbed energy on a number of factors, including a particle radius, a degree of the shape deviation from a spherical one, a pulse duration, the orientation of the magnetic field upon particle, the magnitude of carrier frequency, and the value of a shift of the carrier frequency of a laser ray from the frequency of the surface plasmon excitation in a spherical particle. An appreciable absorption grows at the length of free electron pass large compared to the particle size is established. The phenomenological and kinetic approach is compared each with other.

arXiv comment16 pages, 8 figures

References in corpus (3)

• Observation of intrinsic size effects in the optical response of individual gold nanoparticles
• Oscillatory Size-Dependence of the Surface Plasmon Linewidth in Metallic Nanoparticles
• Lifetime of the first and second collective excitations in metallic nanoparticles

Cited by in corpus (4)

• Optical and transport properties of spheroidal metal nanoparticles with account for the surface effect
• Radiative damping of surface plasmon resonance in spheroidal metallic nanoparticle embedded in a dielectric medium
• Estimation of electron temperature in heated metallic nanoparticle
• Influence of nanoparticle surface and shape on the dipole magnetic absorption of ultrashort laser pulses