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Enhanced Energy Transfer in Resonating Gold Doped Matter Irradiated by Infrared Laser
Abstract
Recent advancements in laser-induced fusion have revealed that resonating dopes in matter can enhance energy absorption from laser waves, facilitating fusion initiation, particularly in laser-driven inertial confinement fusion (ICF). We numerically model and investigate the interaction of intense laser pulses with matter doped with gold nanoparticles of various shapes and configurations. Using a kinetic model implemented in EPOCH numerical software, we examine the response of gold-doped matter to short, intense bursts of infrared radiation (~800 nm, ~100 fs), and model electron ejection dynamics, ionization, and energy transfer, focusing on the energy of protons upon ionization of matter.
Our simulations confirm that nanoantennas significantly enhance energy absorption compared to undoped matter. Among various shapes, dipole and crossed nanoantennas stand out for their resonance efficiency. Crossed quadrupole nanoantennas maintain resonance regardless of orientation, unlike dipoles, which require alignment with the polarization vector E. The energy absorption peaks at nanoantenna arm size ~85 nm. Increasing the laser intensity to 4×10^17 W/cm² results in more than an order-of-magnitude increase in ion energy as compared with that for 4×10^15 W/cm² wave. Further increase to 4×10^18 W/cm² does not yield significant energy gain for protons in the presence of dipole antennas. Energy saturation is observed due to ejection of conduction electrons, disrupting the resonance. Our theoretical results for dipole antenna dopes agree with the experiments, conducted at ELI-ALPs laboratories at Szeged (HU), confirming their validity.
The 3D crossed sextuples yield ~ 2 times stronger field around as compared with dipoles; crossed antennas yield ~ 2 gain over the dipoles. Moreover, the dipole nanoantennas lose their efficiency earlier than 2D and 3D crosses, making the latter more suitable for extreme fields. These advanced antenna configurations especially in the close placement enhance the near field between them and prove to be most efficient at producing high-energy protons at high intensities, outperforming optimally aligned dipoles.
Our discoveries suggest that nanoantenna doping optimizes energy absorption in laser-matter interactions, making crossed quadrupoles especially in 3D configuration and paired placement a promising candidate for enhancing ICF fuel ignition and other high-intensity laser applications.
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| Internet talk | No |
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| Is this an abstract from experimental collaboration? | No |
| Name of experiment and experimental site | N/A |
| Is the speaker for that presentation defined? | Yes |
