Journal of East China Normal University(Natural Sc ›› 2017, Vol. 2017 ›› Issue (2): 89-96.doi: 10.3969/j.issn.1000-5641.2017.02.012

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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   

  1. 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


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

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