材料科学
光学
飞秒
制作
激光器
涂层
光学涂层
薄膜
光电子学
纳米技术
物理
医学
病理
替代医学
作者
Pin Feng,Lan Jiang,Xin Li,Wenlong Rong,Kaihu Zhang,Qiang Cao
出处
期刊:Applied Optics
[The Optical Society]
日期:2015-02-12
卷期号:54 (6): 1314-1314
被引量:27
摘要
A simple, repeatable approach is proposed to fabricate large-area, uniform periodic surface structures by a femtosecond laser. 20 nm gold films are coated on semiconductor surfaces on which large-area, uniform structures are fabricated. In the case study of silicon, cross-links and broken structures of laser induced periodic surface structures (LIPSSs) are significantly reduced on Au-coated silicon. The good consistency between the scanning lines facilitates the formation of large-area, uniform LIPSSs. The diffusion of hot electrons in the Au films increases the interfacial carrier densities, which significantly enhances interfacial electron–phonon coupling. High and uniform electron density suppresses the influence of defects on the silicon and further makes the coupling field more uniform and thus reduces the impact of laser energy fluctuations, which homogenizes and stabilizes large-area LIPSSs.
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