Abnormal ripple patterns with enhanced regularity and continuity in a bulk metallic glass induced by femtosecond laser irradiation
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Abstract
Two types of abnormal ripple patterns: classical ripples (C-ripples) with continuous ridges and unclassical ripples (U-ripples) with regular micropores were investigated in a Zr-based bulk metallic glass (Zr-BMG) after femtosecond laser beam irradiation. U-ripples with a period of \(\sim \)1,600 nm and the orientation nearly parallel to the polarization of laser beam were observed to form gradually on the top of C-ripples with the effective pulse number. Micropores created by the superposition of C-ripples and U-ripples had an average diameter of \(\sim \)750 nm nearly equal to the period of C-ripples (\(\sim \)720 nm) and ran along parallel lines in the grooves of U-ripples. Both U-ripples and C-ripples in Zr-BMG showed significant microstructural differences comparing with those in a conventional Zr-based alloy with the same composition and processing conditions, including much more regular and continuous ridges. The results indicate that the amorphous structure in Zr-BMG plays a key role in the uniform morphology of laser-induced structures.
Keywords
Surface Plasmon Polaritons Laser Fluence Capillary Wave Femtosecond Laser Irradiation Indium PhosphideNotes
Acknowledgments
The financial supports provided by High Technology Research and Development Program of China (No.2007AA03A225), New Century Excellent Talents in University, Chinese Ministry of Education (Grant no.: NCET-06-0079), and the CAS/SAFEA International Partnership Program for Creative Research Teams are gratefully acknowledged.
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