Comparative analysis of optical absorption and resonating dynamics of nanoantenna dopes at intense laser shots

Zsukovszkij, Konstantin and Papp, István (2025) Comparative analysis of optical absorption and resonating dynamics of nanoantenna dopes at intense laser shots. EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, in pre. ISSN 1951-6355

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Abstract

In this study, the resonant behaviour of gold nanoparticles in the dense medium under intense 1015–1017 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.

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