Optik | 2021
Anti-reflective and wetting properties of femtosecond pulsed laser textured Al alloy surfaces
Abstract
Abstract The effects of laser surface texturing of aluminium alloy targets on the morphologies, wetting properties, and anti-reflection were studied. The parallel micro-trenches with a period of 50\xa0µm were processed by fs-laser line scanning with different laser pulse fluences and laser scanning speeds. The laser textured surfaces showed some micro-cracks, micro-bumps, and micro-porous structures with some nanoparticles decoration. The water wetting response of the samples was measured by static contact angle measurements. With high laser fluence irradiation, the laser-textured Al alloy surfaces exhibited hydrophilic characteristics, while that of low laser fluence irradiation showed hydrophobic characteristics. Furthermore, the anti-reflection performance in the spectral range of 200\xa0nm – 1200\xa0nm with the value lower than 5% was obtained at high laser fluence irradiation. The results imply the potential applications of these surfaces in a variety of fields.