Large-Beam Picosecond Interference Patterning of Metallic Substrates

oleh: Petr Hauschwitz, Dominika Jochcová, Radhakrishnan Jagdheesh, Martin Cimrman, Jan Brajer, Danijela Rostohar, Tomáš Mocek, Jaromír Kopeček, Antonio Lucianetti, Martin Smrž

Format: Article
Diterbitkan: MDPI AG 2020-10-01

Deskripsi

In this paper, we introduce a method to efficiently use a high-energy pulsed 1.7 ps HiLASE Perla laser system for two beam interference patterning. The newly developed method of large-beam interference patterning permits the production of micro and sub-micron sized features on a treated surface with increased processing throughputs by enlarging the interference area. The limits for beam enlarging are explained and calculated for the used laser source. The formation of a variety of surface micro and nanostructures and their combinations are reported on stainless steel, invar, and tungsten with the maximum fabrication speed of 206 cm<sup>2</sup>/min. The wettability of selected hierarchical structures combining interference patterns with 2.6 µm periodicity and the nanoscale surface structures on top were analyzed showing superhydrophobic behavior with contact angles of 164°, 156°, and 150° in the case of stainless steel, invar, and tungsten, respectively.