Unidirectionally oriented nanocracks on metal surfaces irradiated by low-fluence femtosecond laser pulses
Unidirectionally oriented nanocracks on metal surfaces irradiated by low-fluence femtosecond laser pulses
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DOI：
10.1063/1.4827296
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发表时间：
2013-10
影响因子：
4
通讯作者：
M. Shimizu;M. Hashida;Y. Miyasaka;S. Tokita;S. Sakabe
中科院分区：
文献类型：
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作者：
M. Shimizu;M. Hashida;Y. Miyasaka;S. Tokita;S. Sakabe
我们研究了低通量飞秒激光脉冲在金属上形成的纳米结构的起源。在钨、钼和铜靶上产生垂直于入射激光偏振方向的纳米级裂纹。裂纹的数量密度随着脉冲数量的增加而增加，但裂纹长度趋于平稳。时域有限差分法的电磁场模拟表明，金属表面纳米级孔周围沿垂直于入射激光偏振方向的电场局部增强。裂纹的形成源于孔。
We have investigated the origin of nanostructures formed on metals by low-fluence femtosecond laser pulses. Nanoscale cracks oriented perpendicular to the incident laser polarization are induced on tungsten, molybdenum, and copper targets. The number density of the cracks increases with the number of pulses, but crack length plateaus. Electromagnetic field simulation by the finite-difference time-domain method indicates that electric field is locally enhanced along the direction perpendicular to the incident laser polarization around a nanoscale hole on the metal surface. Crack formation originates from the hole.