Generation of periodic nanobumps through a double-scan method with femtosecond lasers
Generation of periodic nanobumps through a double-scan method with femtosecond lasers
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DOI：
10.1016/j.jmapro.2023.05.020
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发表时间：
2023-05
影响因子：
6.2
通讯作者：
Kewei Li;Shreyas Limaye;Xin Zhao
中科院分区：
文献类型：
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作者：
Kewei Li;Shreyas Limaye;Xin Zhao
超快激光表面结构化是一种很有前途的精确控制材料表面功能的技术。纳米波纹是典型的激光诱导周期性表面结构，它可以有效地调节表面颜色，但只能在一个观察方向上。为了克服这个问题，需要用于制造其他类型的结构的有效方法。在这项研究中，我们成功地形成周期性的纳米凸点结构，使用一个简单的双扫描方法，在同一个表面进行两个连续的激光扫描不同的偏振方向。这些有趣的纳米结构的形成行为的关系，如峰值激光能量密度，重叠比，和两次扫描之间的偏振角的激光参数进行了研究。对形成机理进行了假设和证实。所获得的纳米凸点表现出优异的光学性能相比，纳米涟漪，通过提高可视角，从而扩大了可能的应用的超快激光表面结构化技术。
Ultrafast laser surface structuring is a promising technique for precisely controlling the surface functions of materials. Nanoripples, the typical laser-induced periodic surface structures, are effective at regulating surface colors, but only in one view direction. To overcome this issue, effective methods for fabricating other types of structures are needed. In this study, we successfully form periodic nanobump structures using a simple double-scan approach, in which the same surface is subjected to two consecutive laser scans with different polarization directions. The formation behavior of these intriguing nanostructures is investigated in relation to laser parameters such as peak laser fluence, overlapping ratio, and polarization angle between two scans. The formation mechanism is hypothesized and confirmed. The obtained nanobumps exhibit exceptional optical performance compared to nanoripples by enhancing the visibility angle, hence expanding the possible applications of the ultrafast laser surface structuring technique.