Alignment of nanoparticles formed on the surface of 6H-SiC crystals irradiated by two collinear femtosecond laser beams

作者：Tianqing Jia, Fuli Zhao, Min Huang, H. X. Chen, Jianrong Qiu, R. X. Li, Zhenzhu Xu, Hiroto Kuroda · 发表于：Applied Physics Letters · 年份：2006 · DOI：10.1063/1.2186067 · 被引用次数：65 · 研究领域：Laser Material Processing Techniques、Diamond and Carbon-based Materials Research、Advanced Surface Polishing Techniques

Nanoripples with periods of 150 and 80nm are formed on the surface of 6H-SiC crystals irradiated by the p-polarized 800nm and the s-polarized 400nm femtosecond lasers, respectively. When both of the two collinear laser beams focus simultaneously on the sample surface, nanoparticles are formed on the whole ablation area, and they array in parallel lines. We propose and confirm that the second harmonics in the sample surface excited by the incident lasers plays an important role in the formation of nanostructures.