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通过控制飞秒激光脉冲分别在线偏振和角向偏振条件下的入射脉冲个数,在金属钨材料表面获得了周期性亚波长条纹和金属纳米线复合而成的新型微纳米结构。实验结果表明,线偏振激光脉冲诱导形成亚波长表面条纹结构的周期和脊面宽度随脉冲个数的增加而减小;在两种不同偏振情况下,飞秒激光脉冲在样品表面诱导形成的金属纳米线结构随激光脉冲个数的增加逐渐趋于消失,而形成微纳米结构的区域面积随激光脉冲个数逐渐增加而增大,并在飞秒激光脉冲个数为150时趋于不变。
By controlling the number of incident pulses under the condition of linear polarization and angular polarization respectively, a novel micro-nano structure composed of periodic subwavelength stripes and metal nanowires was obtained on the surface of tungsten metal. The experimental results show that the periodic and ridge widths induced by linearly polarized laser pulses decrease with the increase of the number of pulses. In two different polarization cases, the femtosecond laser pulses induce the formation of metal on the sample surface The nanowire structure gradually disappears with the increase of the number of laser pulses, and the area of the micro-nano structure increases with the increase of the number of laser pulses and tends to be constant when the number of femtosecond laser pulses is 150.