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Nanomaterials 2018, 8(7), 458; https://doi.org/10.3390/nano8070458

Formation of Slantwise Surface Ripples by Femtosecond Laser Irradiation

1
The Guo China-US Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Science, Beijing 100049, China
3
School of the Gifted Young, University of Science and Technology of China, Hefei 230026, China
4
The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
*
Authors to whom correspondence should be addressed.
Received: 26 May 2018 / Revised: 19 June 2018 / Accepted: 19 June 2018 / Published: 22 June 2018
(This article belongs to the Special Issue Laser-Based Nano Fabrication and Nano Lithography)
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Abstract

We report on the formation of slantwise-oriented periodic subwavelength ripple structures on chromium surfaces irradiated by single-beam femtosecond laser pulses at normal incidence. Unexpectedly, the ripples slanted in opposite directions on each side the laser-scanned area, neither perpendicular nor parallel to the laser polarization. The modulation depth was also found to change from one ripple to the next ripple. A theoretical model is provided to explain our observations, and excellent agreement is shown between the simulations and the experimental results. Moreover, the validity of our theory is also confirmed on bulk chromium surfaces. Our study provides insights for better understanding and control of femtosecond laser nanostructuring. View Full-Text
Keywords: femtosecond laser; laser-induced periodic surface structures; anomalous slanting ripples; chromium femtosecond laser; laser-induced periodic surface structures; anomalous slanting ripples; chromium
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zheng, X.; Cong, C.; Lei, Y.; Yang, J.; Guo, C. Formation of Slantwise Surface Ripples by Femtosecond Laser Irradiation. Nanomaterials 2018, 8, 458.

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