Fan Peixun, Zhong Minlin, Li Lin, Huang Ting, Zhang Hongjun
Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China.
Opt Express. 2013 May 20;21(10):11628-37. doi: 10.1364/OE.21.011628.
A surface micro/nano structuring technique was demonstrated by utilizing a picosecond laser beam to rapidly modify the optical property of copper surfaces with a scanning speed up to tens of millimeters per second. Three kinds of surface micro/nanostructures corresponding to three levels of reflectance were produced which are obviously different from those induced by a femtosecond or nanosecond laser. Specifically, a porous coral-like structure results in over 97% absorptivity in the visible spectral region and over 90% absorptivity in average in the UV, visible, and NIR regions (250 - 2500 nm). Potential applications may include solar energy absorbers, thermal radiation sources, and radiative heat transfer devices.
通过利用皮秒激光束以高达每秒数十毫米的扫描速度快速改变铜表面的光学特性，展示了一种表面微/纳米结构化技术。产生了对应于三种反射率水平的三种表面微/纳米结构，它们明显不同于飞秒或纳秒激光诱导的结构。具体而言，一种多孔珊瑚状结构在可见光谱区域的吸收率超过97%，在紫外、可见和近红外区域（250 - 2500 nm）平均吸收率超过90%。潜在应用可能包括太阳能吸收器、热辐射源和辐射传热装置。
