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Molecular Dynamics Simulation of Cluster Formation in Femtosecond Laser Ablation

机译：飞秒激光烧蚀团簇形成的分子动力学模拟

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摘要

Short-period laser ablation of a platinum solid target was investigated through three-dimensional classical molecular dynamics simulations using the embedded atom method potential. The platinum target was ablated by an ultrashort-pulse laser with three different fluences near the ablation threshold and single 100-fs pulse. Although each laser fluence causes melting and evaporation of the target surface, ablation processes are morphologically different. When the laser fluence is just above the ablation threshold, the surface layer of the solid target breaks away, and so-called spallation occurs. With the moderate laser fluence, homogeneous nucleation of nano-sized clusters takes place in the liquidized layer at the surface, resulting in the homogenization in the emitted cluster size, while the surface layer fragments and vaporizes with the higher fluence. Moreover, in the spallation regime, the recreated surface has nano-sized roughness and is formed after the surface oscillates with a ～20-ns period. This inherent roughness formation may be a seed of the nano-sized regular structure observed by past experiments with repetitive pulses.
机译：通过使用嵌入原子方法势的三维经典分子动力学模拟研究了铂固体靶的短周期激光烧蚀。用超短脉冲激光烧蚀铂靶，激光在烧蚀阈值附近具有三个不同的注量，并具有单个100-fs脉冲。尽管每种激光通量都会引起目标表面的熔化和蒸发，但是烧蚀过程在形态上是不同的。当激光能量密度刚好高于烧蚀阈值时，固体靶材的表面层破裂，发生所谓的散裂。利用适中的激光能量密度，纳米尺寸团簇的均匀成核在表面的液化层中发生，导致发射团簇尺寸的均质化，而表面层则以更高的能量密度碎裂和汽化。此外，在散裂状态下，重新形成的表面具有纳米级的粗糙度，并且是在表面以〜20 ns的周期振动后形成的。这种固有的粗糙度形成可能是过去的重复脉冲实验观察到的纳米尺寸规则结构的种子。

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