Hwang Taek Yong, Shin Heedeuk, Lee Hai Joong, Lee Hyo Soo, Guo Chunlei, Lee Byounghwak
Opt Lett. 2020 Jul 1;45(13):3414-3417. doi: 10.1364/OL.396375.
Following femtosecond (fs) laser pulse irradiation, the formation of a new type of low-spatial-frequency laser-induced periodic surface structure (LSFL) patterns, namely, omnidirectional LSFLs (OD-LSFLs) with the periodic ordering of their orientations, are investigated on Ni in this Letter. Using a liquid crystal polymer patterned depolarizer, we periodically rotate the polarization of fs laser pulses across the laser spot and create OD-LSFLs by raster scanning fs laser pulses. We also show that the period of the OD-LSFL orientation rotation can be controlled with the defocused distance, and OD-LSFLs can significantly expand the viewing angle of the structural colors in the azimuthal direction without noticeable color degradations.
在本文中，我们研究了飞秒（fs）激光脉冲辐照后，在镍表面形成的一种新型低空间频率激光诱导周期性表面结构（LSFL）图案，即具有周期性取向排列的全向LSFL（OD-LSFL）。使用液晶聚合物图案化消偏器，我们使fs激光脉冲的偏振在激光光斑上周期性旋转，并通过光栅扫描fs激光脉冲产生OD-LSFL。我们还表明，OD-LSFL取向旋转的周期可以通过离焦距离来控制，并且OD-LSFL可以在方位角方向上显著扩展结构色的视角，而不会出现明显的颜色退化。
