The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Opt Lett. 2011 Jul 1;36(13):2575-7. doi: 10.1364/OL.36.002575.
In this Letter, we generate laser-induced periodic surface structures (LIPSSs) on platinum following femtosecond laser pulse irradiation. For the first time to our knowledge, we study the morphological profile of LIPSSs over a broad incident angular range, and find that the morphological profile of LIPSSs depends significantly on the incident angle of the laser beam. We show that LIPSS grooves become more asymmetric at a larger incident angle, and the morphological profile of LIPSSs formed at an incident angle over 55° eventually resembles that of a blazed grating. Our study suggests that the formation of the blazed groove structures is attributed to the selective ablation of grooves through the asymmetric periodic surface heating following femtosecond pulse irradiation. The blazed grooves are useful for controlling the diffraction efficiency of LIPSSs.
在这封信件中，我们在铂上产生了飞秒激光脉冲照射后的激光诱导周期性表面结构（LIPSSs）。据我们所知，这是首次研究宽入射角范围内 LIPSSs 的形态轮廓，我们发现 LIPSSs 的形态轮廓显著依赖于激光束的入射角。我们表明，随着入射角的增大，LIPSS 凹槽变得更加不对称，而在入射角超过 55°时形成的 LIPSSs 的形态轮廓最终类似于闪耀光栅。我们的研究表明，闪耀槽结构的形成归因于飞秒脉冲照射后通过不对称的周期性表面加热选择性地烧蚀凹槽。闪耀槽对于控制 LIPSSs 的衍射效率很有用。
