Phase transformation and nanograting structure on TiO2 rutile single crystal induced by infrared femtosecond laser
Ma Hong-Liang(马洪良)a), Yang Jun-Yi(杨俊毅)a), Lu Bo(鲁波)a), and Ma Guo-Hong(马国宏)b)
a Instrumental Analysis & Research Center, Shanghai University, Shanghai 200444, China; b Department of Physics, Shanghai University, Shanghai 200444 China
Abstract In this paper, Titanium dioxide (TiO$_{2})$ rutile single crystal was irradiated by infrared femtosecond laser pulses with repetition rate of 250 kHz. For a P-polarized femtosecond laser, the periodic nanograting structure on the ablation crater surface was formed . The periodicity is much less than the laser wavelength. The direction of nanograting alignment depends on the polarization laser beam. Micro-Raman spectra show that the intensity of Eg Raman vibrating mode of rutile phase increases and that of A1g Raman vibrating mode decreases apparently within the ablation crater. With the increase of irradiation time and laser average power, the Raman vibrating modes of anatase phase emerged. Rutile phase of TiO$_{2}$ single crystal is partly transformed into anatase phase.
Ma Hong-Liang(马洪良), Yang Jun-Yi(杨俊毅), Lu Bo(鲁波), and Ma Guo-Hong(马国宏) Phase transformation and nanograting structure on TiO2 rutile single crystal induced by infrared femtosecond laser 2007 Chinese Physics 16 3328
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