Femtosecond pulse laser-induced self-organized nanostructures on the surface of ZnO crystal |
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| Authors: | Zhong Min-Jian Guo Guang-Lei Yang Jun-Yi Ma Ning-Hu Ye Guo Guo Xiao-Dong Li Ru-Xin and Ma Hong-Liang |
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| Institution: | Department of Physics, Shanghai University,
Shanghai
200444, China; Department of Physics, Shanghai University,
Shanghai
200444, China
^b)Instrumental Analysis and Research Center, Shanghai
University, Shanghai 200444, China; State Key Laboratory of High Field Laser Physics,
Shanghai Institute of Optics and Fine Mechanics,
Chinese Academy
of
Sciences, Shanghai 201800, China |
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| Abstract: | This paper reports self-organized nanostructures observed on the
surface of ZnO crystal after irradiation by a focused beam of a
femtosecond Ti:sapphire laser with a repetition rate of 250\,kHz.
For a linearly polarized femtosecond laser, the periodic nanograting
structure on the ablation crater surface was promoted. The period of
self-organization structures is about 180\,nm. The grating
orientation is adjusted by the laser polarization direction. A long
range Bragg-like grating is formed by moving the sample at a speed
of 10\,\mu m/s. For a circularly polarized laser beam, uniform
spherical nanoparticles were formed as a result of Coulomb explosion
during the interaction of near-infrared laser with ZnO crystal. |
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| Keywords: | infrared femtosecond laser ZnO
crystal nanograting nanostructure |
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