飞秒激光脉冲在金属表面诱导产生的高空间频率周期性结构。

High spatial frequency periodic structures induced on metal surface by femtosecond laser pulses.

作者信息

Yao Jian-Wu, Zhang Cheng-Yun, Liu Hai-Ying, Dai Qiao-Feng, Wu Li-Jun, Lan Sheng, Gopal Achanta Venu, Trofimov Vyacheslav A, Lysak Tatiana M

机构信息

Laboratory of Photonic Information Technology, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou, China.

出版信息

Opt Express. 2012 Jan 16;20(2):905-11. doi: 10.1364/OE.20.000905.

DOI:10.1364/OE.20.000905

PMID:22274437

Abstract

The high spatial frequency periodic structures induced on metal surface by femtosecond laser pulses was investigated experimentally and numerically. It is suggested that the redistribution of the electric field on metal surface caused by the initially formed low spatial frequency periodic structures plays a crucial role in the creation of high spatial frequency periodic structures. The field intensity which is initially localized in the grooves becomes concentrated on the ridges in between the grooves when the depth of the grooves exceeds a critical value, leading to the ablation of the ridges in between the grooves and the formation of high spatial frequency periodic structures. The proposed formation process is supported by both the numerical simulations based on the finite-difference time-domain technique and the experimental results obtained on some metals such as stainless steel and nickel.

摘要

对飞秒激光脉冲在金属表面诱导产生的高空间频率周期性结构进行了实验和数值研究。研究表明，由最初形成的低空间频率周期性结构引起的金属表面电场重新分布在高空间频率周期性结构的产生中起着关键作用。当凹槽深度超过临界值时，最初集中在凹槽中的场强会集中到凹槽之间的脊上，导致凹槽之间的脊被烧蚀并形成高空间频率周期性结构。基于时域有限差分技术的数值模拟以及在不锈钢和镍等一些金属上获得的实验结果均支持了所提出的形成过程。