title: Rapid fabrication of surface micro/nano structures with enhanced broadband absorption on Cu by picosecond laser.
abstract: 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.
authors.affiliation: Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China.
authors.forename: Peixun
authors.initials: P
authors.lastname: Fan
authors.forename: Minlin
authors.initials: M
authors.lastname: Zhong
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Ting
authors.initials: T
authors.lastname: Huang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000042:Absorption; D003300:Copper / Q000737:chemistry* / Q000528:radiation effects*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D008422:Materials Testing; D053758:Nanoparticles / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D012031:Refractometry / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D013499:Surface Properties / Q000528:radiation effects
chemical_list: D003300:Copper