飞秒
火炬
纳米结构
材料科学
镍
等离子体
激光器
基质(水族馆)
等离子炬
激光烧蚀
羽流
纳米技术
光电子学
化学工程
冶金
光学
热力学
物理
地质学
工程类
海洋学
量子力学
焊接
作者
Kai Yin,Ji’an Duan,Cong Wang,Xinran Dong,Yuxin Song,Zhi Luo
摘要
In this letter, we perform a comprehensive study of micro torch effect on the formation of femtosecond laser-induced nanostructures on nickel. Under identical experimental conditions, laser induced nanostructures and periodic surface patterns exhibit distinctly different level of morphology with and without the micro torch. In addition, assisted by the micro torch, the ablation threshold is considerably reduced and the content of oxygen in the textured nanostructures keeps a stable low level. It is suggested that the change on the surface directly relates to the status of plasma plume and substrate heating. With the assistance of the micro torch, laser induced plasma plume is confined and its density at center region is raised, which results in the increase of the central plasma's temperature, more energy deposited on the nickel surface, and ultimately leading to the changes in the nanostructures' morphology and ablation threshold.
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