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Title: Femtosecond laser-induced ripple structures on magnesium
Authors: Guan, Y.C.
Zhou, W.
Li, Z.L.
Zheng, H.Y.
Lim, G.C.
Hong, M.H. 
Issue Date: 2014
Citation: Guan, Y.C., Zhou, W., Li, Z.L., Zheng, H.Y., Lim, G.C., Hong, M.H. (2014). Femtosecond laser-induced ripple structures on magnesium. Applied Physics A: Materials Science and Processing 115 (1) : 13-18. ScholarBank@NUS Repository.
Abstract: Two types of periodic surface structures including micro-ripples and nano-ripples were observed on magnesium after femtosecond laser irradiation, and the color effect was reported by scanning a single laser beam over a large area at near damage threshold fluence. Optical reflectance measurement revealed that the color effect was mainly attributed to the nano-ripples as diffraction gratings, and intensity of the color was affected by morphology of the micro-ripples. AFM and SEM images showed that orientation of the micro-ripples was parallel to laser polarization and the period of the micro-ripples increased with scanning numbers, while the orientation of the nano-ripples was perpendicular to laser polarization and the period of the nano-ripples kept constant as laser sub-wavelength with increasing scanning numbers. These results suggested that formation of the micro-ripples was due to the combined effect of initial surface roughness and near-field interference, while formation of the nano-ripples was caused by the near-field interference between incident light and surface plasmons being excited in the air and metal interface. The potential application of such an effect is further proposed. © 2013 Springer-Verlag Berlin Heidelberg.
Source Title: Applied Physics A: Materials Science and Processing
ISSN: 14320630
DOI: 10.1007/s00339-013-7927-5
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