Applied Physics A

, Volume 92, Issue 3, pp 635–642 | Cite as

Sub-wavelength surface structuring of NiTi alloy by femtosecond laser pulses

  • Yang Yang
  • Jianjun Yang
  • Chunyong Liang
  • Hongshui Wang
  • Xiaonong Zhu
  • Dengfeng Kuang
  • Yong Yang
Article

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.

PACS

61.80.Ba 79.20.Ds 81.65.Cf 81.40.Wx 79.60.Jv 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Yang Yang
    • 1
  • Jianjun Yang
    • 1
  • Chunyong Liang
    • 2
  • Hongshui Wang
    • 2
  • Xiaonong Zhu
    • 1
  • Dengfeng Kuang
    • 1
  • Yong Yang
    • 1
  1. 1.Institute of Modern OpticsNankai University, Key Laboratory of Opto-electronic Information Science and Technology, Education Ministry of ChinaTianjinChina
  2. 2.School of Materials Science and EngineeringHebei University of TechnologyTianjinChina

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