Sub-wavelength surface structuring of NiTi alloy by femtosecond laser pulses |
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Authors: | Yang Yang Jianjun Yang Chunyong Liang Hongshui Wang Xiaonong Zhu Dengfeng Kuang Yong Yang |
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Institution: | (1) Institute of Modern Optics, Nankai University, Key Laboratory of Opto-electronic Information Science and Technology, Education Ministry of China, Tianjin, 300071, China;(2) School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China |
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Abstract: | Generation of self-organized sub-wavelength surface structures on a nickel–titanium alloy plate by femtosecond laser pulses
is investigated experimentally through line-scribing experiments in air. It is found that Bragg-like relief gratings, with
the orientation perpendicular to the laser polarization, are formed over the entire laser-scribed regions. The average period
is measured as 630±30 nm. Distinctive features of these novel surface structures include nanoparticle-covered grating ridges
and the maintainable spatial period regardless of incidence angles. With different laser parameters and sample scan speeds,
sub-wavelength grating structures can evolve into cellular-like nanotextures. Optimal conditions for forming these surface
structures are determined in terms of laser energy and scan speed. Elementary analyses of the structured surfaces by X-ray
diffraction and photoelectron spectroscopy reveal that both the crystal structures and the chemical elements can remain in
their original states, but the surface grains are refined and the atomic percentages are varied after femtosecond laser treatments. |
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Keywords: | PACS" target="_blank">PACS 61 80 Ba 79 20 Ds 81 65 Cf 81 40 Wx 79 60 Jv |
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