Theory for absorption of ultrashort laser pulses by spheroidal metallic nanoparticles

Details Theory for absorption of ultrashort laser pulses by spheroidal metallic nanoparticles Theory for absorption of ultrashort laser pulses by spheroidal metallic nanoparticles

2011-07-25

arxiv.org/abs/1107.4955v1

Physical Review B 80, 155456 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 8 figures

Scientific paper

10.1103/PhysRevB.80.155456

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.

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