In this study, the resonant behaviour of gold nanoparticles in the dense medium under
intense similar to\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym}
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W/cm2 laser irradiation by infrared pulses is explored. In particular, the enhancement
of the energy absorption by the dopes in media is addressed. The particle-in-cell
numeral method is used. Using numerical modelling with the EPOCH software, we investigate
how nanoparticles of various shapes act as resonant nanoantennas. We analyze the absorption
characteristics of the medium and calculate ionization product energies for protons,
electrons and ions. Comparative analysis identifies optimal conditions for energy
absorption and ionization and their enhancement using nanoparticles of different shapes
and sizes, including quadrupole, dipole, and spherical shapes. We examine in detail
the ionization dynamics in the presence of quadrupole nanoantennas and address energy
absorption saturation.
