Reducing nanoparticles in metal ablation plumes produced by two delayed short laser pulses
Reducing nanoparticles in metal ablation plumes produced by two delayed short laser pulses
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DOI：
10.1063/1.3079404
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发表时间：
2009-02
影响因子：
4
通讯作者：
S. Noël;J. Hermann
中科院分区：
文献类型：
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作者：
S. Noël;J. Hermann
使用快速成像和原子力显微镜，我们证明了纳米粒子的分数在烧蚀羽流产生的短脉冲激光照射的金属强烈改变时，施加足够大的延迟的第二激光脉冲。比较金和铜得到的结果，它表明，只有观察到一个显着的纳米颗粒减少，如果两个激光脉冲之间的延迟超过电子晶格热化的特征时间。我们提出了减少电子热传输在大晶格温度作为所观察到的纳米粒子减少的主导机制。
Using fast imaging and atomic force microscopy, we demonstrate that the fraction of nanoparticles in ablation plumes produced by short pulse laser irradiation of metals is strongly altered when a second laser pulse of sufficiently large delay is applied. Comparing the results obtained for gold and copper, it is shown that a significant nanoparticle reduction is only observed if the delay between both laser pulses exceeds the characteristic time of electron-lattice thermalization. We propose the reduced electronic heat transport at large lattice temperature as the dominant mechanisms for the observed nanoparticle reduction.