材料科学
飞秒
激光器
光电子学
光学
表面微加工
制作
宽带
薄膜
纳米技术
医学
物理
病理
替代医学
作者
K Thirunaukkarasu,Md Abu Taher,Nitin Chaudhary,Vinod K. Rajput,Chavan Akash Naik,Jai Prakash Gautam,Sri Ram G. Naraharisetty
标识
DOI:10.1016/j.optlastec.2022.107935
摘要
Fabrication of extreme black surfaces using femtosecond laser micromachining is demonstrated. Mechanical and thermal stability are important parameters that limit the lifetime performance of anti-reflective surfaces in optical instruments. We have fabricated nanostructured omnidirectional anti-reflective surfaces on a light-weight, thin stainless-steel sheets of thickness 50 and 100 μm. This work reports less than 0.5% reflectivity for a wide range of wavelength from UV to NIR (400 to 2500 nm) and with the wide acceptance of incidence angles (±60°). Cross-sectional thickness variations and mechanical strengths of these laser irradiated sheets are tested by using the FESEM and Micro Vickers hardness studies, respectively. We demonstrated thermal stability up to 300 °C temperature and much superior mechanical strength than chemically coated surfaces for broadband applications. These ultra-black SS thin sheets have potential applications in suppressing stray light in many optical and optoelectronic devices, low light imaging sensors, solar cells, satellite-based optical payloads, etc.
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