飞秒激光在银膜表面诱导亚波长周期条纹的超快成像研究

doi:10.3969/j.issn.1000-5641.2017.02.012

华东师范大学学报(自然科学版) ›› 2017, Vol. 2017 ›› Issue (2): 89-96.doi: 10.3969/j.issn.1000-5641.2017.02.012

飞秒激光在银膜表面诱导亚波长周期条纹的超快成像研究

郗慧霞, 周侃, 贾天卿, 孙真荣

华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062

收稿日期:2016-01-05 出版日期:2017-03-25 发布日期:2017-03-23
通讯作者: 贾天卿,男,教授,博士生导师,研究方向为飞秒激光诱导微纳结构及其光学特性.E-mail:tqjia@phy.ecnu.edu.cn E-mail:tqjia@phy.ecnu.edu.cn
作者简介:郗慧霞,女,硕士研究生,研究方向为飞秒激光诱导周期条纹.E-mail:xihuixia@sina.cn
基金资助:
国家自然科学基金（11474097）

Ultrafast imaging of femtosecond laser-induced periodic ripples on the surface of silver film

XI Hui-xia, ZHOU Kan, JIA Tian-qing, SUN Zhen-rong

State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

Received:2016-01-05 Online:2017-03-25 Published:2017-03-23

摘要/Abstract

摘要：

采用440 nm空间分辨、亚皮秒时间分辨的泵浦探测成像技术，本文研究了800 nm飞秒激光脉冲照射银膜表面后亚波长周期条纹的形成动力学.分析了1～6个飞秒脉冲照射下银膜表面条纹结构的演化过程.第一个激光脉冲在薄膜表面诱导凹槽等缺陷结构；第二个激光脉冲以后表面开始出现亚波长周期条纹，并且在更多脉冲照射时进行纵向和横向生长.条纹在50～70 ps以后开始出现，随延迟时间增加不断加深变长，在演化过程中条纹位置保持不变；形成过程在1 000 ps内基本结束.研究结果表明，飞秒激光在薄膜表面诱导凹槽等缺陷结构在后面的激光脉冲照射表面过程中激发了表面等离激元，进而导致的周期性能量沉积在亚波长周期条纹形成过程中起了关键作用，材料表面的熔化导致了之前形成的条纹变浅以及部分消失.

关键词: 飞秒激光, 泵浦探测成像, 亚波长周期条纹, 银膜, 表面等离激元

Abstract:

This paper studies the dynamics of femtosecond laser-induced periodic ripples on silver film by a time-resolved pump-probe imaging method. After 1-6 pump pulses irradiation, the temporal evolution of the periodic ripples on sample surface is observed. The premier ripples appear in the initial 50-70 ps after the second fs laser irradiation, and the ripple positions keep unmoved until the formation processes is completed in 1 000 ps. The results indicate that the periodic deposition of laser energy during the interaction between femtosecond laser pulses and sample surface plays a dominant role in the formation of periodic ripples, which is caused by the excitation of surface plasmon polariton During the solidification process, some ripples become shallow and even disappear because of surface melting.

Key words: femtosecond laser, pump-probe imaging, periodic ripples, silver film, surface plasmon polariton

中图分类号:

O436

郗慧霞, 周侃, 贾天卿, 孙真荣. 飞秒激光在银膜表面诱导亚波长周期条纹的超快成像研究[J]. 华东师范大学学报(自然科学版), 2017, 2017(2): 89-96.

XI Hui-xia, ZHOU Kan, JIA Tian-qing, SUN Zhen-rong. Ultrafast imaging of femtosecond laser-induced periodic ripples on the surface of silver film[J]. Journal of East China Normal University(Natural Sc, 2017, 2017(2): 89-96.

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飞秒激光在银膜表面诱导亚波长周期条纹的超快成像研究

Ultrafast imaging of femtosecond laser-induced periodic ripples on the surface of silver film

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