Novel hydrodynamic instability of the molten Au/Pd alloy film irradiated by tightly focused femtosecond laser pulses

Alexander A. Kuchmizhak , Oleg B. Vitrik , Yuri N. Kulchin
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引用次数: 3

Abstract

Features of nanoscale surface hydrodynamic instabilities induced on the thin Au/Pd alloy films by single femtosecond pulses shaped into the tightly focused quasi-Bessel beam by means of a fiber microaxicon were studied. The thickness of the metal film as well as the pulse energy were found to be the key parameters determined the types of the hydrodynamic instability of the molten film, which results in the formation of different frozen surface relief microstructures: nanojets, nanocrowns and hybrid structures. Single nanojets forms on the surface of the 80-nm-thick film at the pulse energies ranging from 6 to 7 nJ, while for thicker films formation of hybrid structure, a nanojet surrounded by the nanocrown, is observed. Single nanocrown can be fabricated at film thicknesses ranging from 120 to 240 nm at near-threshold pulse energies. The number of nanospikes of the nanocrown was found to be linearly dependent on the pulse energy and the inverse film thickness.

紧聚焦飞秒激光辐照金/钯合金熔膜的新型流体动力学不稳定性
研究了单飞秒脉冲通过光纤微轴透镜形成紧密聚焦准贝塞尔光束在Au/Pd合金薄膜上诱导的纳米尺度表面水动力不稳定性特征。研究发现,金属膜的厚度和脉冲能量是决定熔膜水动力不稳定性类型的关键参数,从而导致不同的冻结表面形貌的形成:纳米射流、纳米冠和杂化结构。脉冲能量在6 ~ 7 nJ范围内,在80 nm厚的薄膜表面形成单个纳米射流,而对于形成混合结构的较厚薄膜,则观察到被纳米冠包围的纳米射流。在接近阈值的脉冲能量下,可以在120 ~ 240 nm的薄膜厚度范围内制备单纳米冠。发现纳米冠的纳米尖峰数与脉冲能量和反膜厚度呈线性关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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