Zheng Xin, Cong Cong, Lei Yuhao, Yang Jianjun, Guo Chunlei
The Guo China-US Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Science, Beijing 100049, China.
Nanomaterials (Basel). 2018 Jun 22;8(7):458. doi: 10.3390/nano8070458.
We report on the formation of slantwise-oriented periodic subwavelength ripple structures on chromium surfaces irradiated by single-beam femtosecond laser pulses at normal incidence. Unexpectedly, the ripples slanted in opposite directions on each side the laser-scanned area, neither perpendicular nor parallel to the laser polarization. The modulation depth was also found to change from one ripple to the next ripple. A theoretical model is provided to explain our observations, and excellent agreement is shown between the simulations and the experimental results. Moreover, the validity of our theory is also confirmed on bulk chromium surfaces. Our study provides insights for better understanding and control of femtosecond laser nanostructuring.
我们报道了在垂直入射的单束飞秒激光脉冲辐照下，铬表面形成倾斜取向的周期性亚波长波纹结构。出乎意料的是，在激光扫描区域的每一侧，波纹向相反方向倾斜，既不垂直也不平行于激光偏振方向。还发现调制深度从一个波纹到下一个波纹会发生变化。提供了一个理论模型来解释我们的观察结果，模拟结果与实验结果显示出极好的一致性。此外，我们的理论在块状铬表面也得到了验证。我们的研究为更好地理解和控制飞秒激光纳米结构化提供了见解。
