Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 49, Issue 43, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/49/43/435105
Keywords
laser-induced periodic surface structures; GaP crystal; two-photon absorption; surface plasmon; period-increasing effect
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Funding
- National Natural Science Foundation of China [11474097, 11274116, 113740995, 11104178, 51132004]
- National Special Science Research Program of China [2011CB808105]
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We report the period-increasing effect of low spatial frequency ripples on a GaP crystal irradiated by 1 kHz, 50 fs, 800 nm femtosecond laser pulses. Massive free electrons are excited by a two-photon absorption process and surface plasmon is excited. The Drude model is used to estimate the changing of the dielectric constant of the GaP crystal. The period-increasing effects of low spatial frequency laser-induced ripples are theoretically predicted in air/water, and the experimental results agree well. The experimental and theoretical results indicate that surface plasmon excited by two-photon absorption plays a key role in the formation of low spatial frequency ripples.
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