Abstract
Designed micro-nano structures on the surface of aluminum alloy provide excellent light trapping properties that can be used extensively in thermal photovoltaics, sensors, etc. However, the fabrication of high-performance antireflective micro-nano structures on aluminum alloy is challenging because aluminum has shallow intrinsic losses and weak absorption. A two-step strategy is proposed for fabricating broadband antireflection structures by superimposing nanostructures onto microscale structures. By optimizing the processing parameters of femtosecond laser, the average reflectances of 2.6% within the visible spectral region (400–800 nm) and 5.14% within the Vis-NIR spectral region (400–2500 nm) are obtained.
Highlights
Surface morphology is crucial in controlling the optical, chemical, biological, and other properties of solid surfaces [1]
Antireflection structures are fabricated by coating black paint on the surface
There are many reports on antireflection micro/nanostructures prepared by the ultrafast laser on metal surfaces
Summary
Surface morphology is crucial in controlling the optical, chemical, biological, and other properties of solid surfaces [1]. Carbon nanotubes (CNTs) on aluminum surfaces yield an efficient absorption rate in a range from ultraviolet to terahertz [5] These CNTs are fragile in extreme environments and require controlled fabrication conditions [6]. There are many reports on antireflection micro/nanostructures prepared by the ultrafast laser on metal surfaces. In addition to micro-nano structures prepared with ultrafast laser, high-quality oxidized nanowires were uniformly grown on copper surfaces in order to enhance optical phonon dissipation. A super-blackening antireflection surface on the surface of aluminum alloy fabricated by pulsed laser has rarely been reported. It is challenging to prepare antireflection surfaces of aluminum alloy due to its low melting temperature and high thermal conductivity [15]. A two-step superimposing strategy was developed in order to process robust metal micro-nano structures via superimposing nanoscale structures onto microscale structures directly
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