Ionization Dynamics in Matter with Gold Nanoparticles upon Laser Irradiation of Various Intensities, Numerical Analysis

We perform the numerical study of the response of the media with golden nanoantennas upon irradiation by intense ~1017–1018 W/cm2 short 0.1 ps laser pulses. We study the influence of resonant nanoantennas on the ionization process and on the ions’ energy evolution at various intensities of laser pulses. Numerical modeling is performed with the help of EPOCH software using the “particle-in-cell” numeral method. The response of resonating nanoantennas of dipole and crossed shapes, embedded in dense media, is studied. The dynamics of ionization and the energies of ions acquired during the passage of the laser pulse are studied. The differences in the ionization energies for nanoantennas of dipole and crossed shapes are explored. The ionization dynamics in the matter doped with nanoantennas is examined; crossed-shaped antennas are identified for the best energy absorption in high-intensity fields.