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Generation, control and erasure of dual LIPSS in germanium with fs and ns laser pulses
Journal of Physics D: Applied Physics ( IF 3.4 ) Pub Date : 2020-09-15 , DOI: 10.1088/1361-6463/abafdf
Noemi Casquero , Yasser Fuentes-Edfuf , Raul Zazo , Javier Solis , Jan Siegel

Laser-induced periodic surface structures (LIPSS) can readily be fabricated in virtually all types of materials and benefit from an efficient parallel patterning strategy that exploits self-organization. The wide range of different LIPSS types with different spatial scales and symmetries is continuously growing, addressing numerous of applications. Here, we report on the formation of two fundamentally different types of LIPSS on germanium upon exposure to femtosecond laser pulses (λ = 800 nm, 130 fs), featuring different periods and orthogonal orientations. On the one hand, the well-known low-spatial frequency LIPSS (LSFL) with a period ≈ λ and perpendicular orientation to the laser polarization are formed, which can be extended homogeneously in 2D by sample scanning. Additionally, extremely smooth ripples with a period ≈λ/2 and parallel orientation were generated at lower pulse numbers. We show that this new kind of ripples, named parallel high-spatial frequency LIPSS (HSFL-∥),...

中文翻译:

利用fs和ns激光脉冲在锗中生成,控制和消除双重LIPSS

激光诱导的周期性表面结构(LIPSS)几乎可以在所有类型的材料中制造,并且受益于利用自组织的有效并行构图策略。具有不同空间比例和对称性的各种不同LIPSS类型正在不断增长,可满足众多应用需求。在这里,我们报道了在飞秒激光脉冲(λ= 800 nm,130 fs)下,锗上两种基本不同类型的LIPSS的形成,其特征是周期和正交方向不同。一方面,形成了众所周知的低周期频率LIPSS(LSFL),其周期≈λ,并且垂直于激光偏振方向,可以通过样本扫描在2D中均匀扩展。另外,在较低的脉冲数下会产生周期为≈λ/ 2且方向平行的极平滑波纹。我们证明了这种新的波纹,称为并行高空间频率LIPSS(HSFL-∥),...
更新日期:2020-09-16
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