激光脉冲辐照下金纳米粒子电离和等离子体现象的数值分析

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-03-25 DOI:10.1016/j.rinp.2025.108198

K. Zsukovszki , I. Papp

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引用次数: 0

摘要

我们研究了在强度为~ 4∙1015-4∙1017 W/cm2的短红外脉冲照射下，金纳米粒子等离子体现象和电离的动力学。对激光辐射与掺杂纳米颗粒的介质相互作用进行了数值模拟；不同形状的纳米粒子被认为是共振纳米天线。利用EPOCH数值软件建立了动力学模型。分析了持续时间≈0.1 ps的红外激光短脉冲在这种掺杂物质中的传播，等离子体激元的形成动力学及其在不同强度场和电离场中的行为。研究了等离子体周围电场的演化、等离子体激元和能量从波到离子的转移。由此产生的电离产物——质子、电子和离子——的动量和能量被计算出来。探讨了不同尺寸的偶极、四极和球形纳米粒子上的等离子体现象。对不同形状的激光器和不同强度的激光脉冲进行了对比分析，旨在找出强激光场中最佳的谐振特性、等离子体寿命和电离产物能量的增加。

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Numerical analysis of ionization and plasmonic phenomena on gold nanodopes upon laser pulse irradiation

We investigate the dynamics of plasmonic phenomena on gold nanoparticles and ionization under irradiation by short infrared pulses with intensities ∼4∙10¹⁵–4∙10¹⁷ W/cm². Numerical modeling of the interaction between laser radiation and the medium doped with nanoparticles (nanodopes) is conducted; various nanoparticles shapes are considered as resonant nanoantennas. A kinetic model is implemented with the EPOCH numerical software. The propagation of short pulses of infrared laser radiation of ≈0.1 ps duration in such doped matter and the dynamics of plasmon formation, its behavior in fields of various intensities and ionization are analyzed. The evolution of the electric field around dopes, of the plasmon and transfer of energy from wave to ions are studied. The momentum and energy of the resulting ionization products—protons, electrons and ions—are calculated. Plasmonic phenomena on nanoparticles of dipole, quadrupole, and spherical shapes and different sizes are explored. The comparative analysis is conducted for various shapes of dopes and various intensities of laser pulses, aiming to identify best resonating properties, plasmon life and increase of the energy of ionization products in strong laser fields.

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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