Open AccessRapid fabrication of surface micro/nano structures with enhanced broadband absorption on Cu by picosecond laser
Author(s) -
Peixun Fan,
Minlin Zhong,
Lin Li,
Ting Huang,
Hongjun Zhang
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.011628
Subject(s) - materials science , optics , molar absorptivity , laser , femtosecond , optoelectronics , nanosecond , picosecond , absorption (acoustics) , attenuation coefficient , physics , composite material
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.