Strong-field ionization of plasmonic nanoparticles
Strong-field ionization of plasmonic nanoparticles
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DOI：
10.1103/physreva.106.033103
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发表时间：
2022-09
影响因子：
2.9
通讯作者：
E. Saydanzad;J. Li;U. Thumm
中科院分区：
文献类型：
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作者：
E. Saydanzad;J. Li;U. Thumm
我们通过强红外激光脉冲模拟了金属纳米粒子的强场电离，解释并区分了光电子（PE）动量分布中PE相关性、PE-残余电荷相互作用、PE重散射和复合以及瞬态激光诱导等离子体场的影响。我们对 5、30 和 70 nm 直径金纳米球以及峰值激光脉冲强度的数值结果显示了 PE 速度图图像如何通过 PE 库仑排斥、残余电荷积累和等离激元近场而清晰地形成。与气态原子靶和介电纳米粒子相比，我们发现直接发射和再散射的PE具有非常大的PE截止能量，超过入射激光脉冲有质动力能量两个数量级。
We modeled strong-field ionization of metal nanoparticles by intense infrared laser pulses, accounting for and distinguishing in photoelectron (PE) momentum distributions the effects of PE correlation, PE–residual-charge interactions, PE rescattering and recombination, and transient laser-induced plasmonic fields. Our numerical results for 5-, 30-, and 70-nm-diameter gold nanospheres and peak laser-pulse intensities ofandshow how PE velocity-map images are distinctly shaped by PE Coulomb repulsion, residual-charge accumulations, and plasmonic near fields. In contrast to gaseous atomic targets and dielectric nanoparticles, we find very large PE cutoff energies, for both directly emitted and rescattered PEs, that exceed the incident laser-pulse ponderomotive energy by two orders of magnitude.