Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals

CORC > 长春光学精密机械与物理研究所 > 中国科学院长春光学精密机械与物理研究所 > 中科院长春光机所知识产出

	Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals
	Fang, R. R.; A. Vorobyev and C. L. Guo
刊名	Light-Science & Applications
	2017
卷号	6
英文摘要	Despite extensive studies of femtosecond laser-material interactions, even the simplest morphological responses following femtosecond pulse irradiation have not been fully resolved. Past studies have revealed only partial dynamics. Here we develop a zerobackground and high-contrast scattered-light-based optical imaging technique through which we capture, for the first time, the complete temporal and spatial evolution of the femtosecond laser-induced morphological surface structural dynamics of metals from start to finish, that is, from the initial transient surface fluctuations, through melting and ablation, to the end of resolidification. We find that transient surface structures first appear at a delay time on the order of 100 ps, which is attributed to ablation driven by pressure relaxation in the surface layer. The formation dynamics of the surface structures at different length scales are individually resolved, and the sequence of their appearance changes with laser fluence is found. Cooling and complete resolidification, observed here for the first time, are shown to occur more slowly than previously predicted by two orders of magnitude. We examine and identify the mechanisms driving each of these dynamic steps. The visualization and control of morphological surface structural dynamics not only are of fundamental importance for understanding femtosecond laser-induced material responses but also pave the way for the design of new material functionalities through surface structuring.
语种	英语
内容类型	期刊论文
源URL	[http://ir.ciomp.ac.cn/handle/181722/58894]
专题	长春光学精密机械与物理研究所_中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Fang, R. R.,A. Vorobyev and C. L. Guo. Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals[J]. Light-Science & Applications,2017,6.
APA	Fang, R. R.,&A. Vorobyev and C. L. Guo.(2017).Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals.Light-Science & Applications,6.
MLA	Fang, R. R.,et al."Direct visualization of the complete evolution of femtosecond laser-induced surface structural dynamics of metals".Light-Science & Applications 6(2017).