Fabrication of functional superhydrophobic surfaces on carbon fibre reinforced plastics by IR and UV direct laser interference patterning

Bioinspired Superhydrophobic Surfaces via Laser-Structuring

“…The LIPSS with nanoscale spatial wavelengths have enriched the complexity of DLIPpatterned hierarchical structures and hence give rise to the overall surface roughness and superhydrophobicity. Besides metals, other substrates can also be structured by DLIP for conveniently obtaining superhydrophobic surfaces, including polymers (Alamri and Lasagni, 2017), graphene oxide (Jiang et al, 2014(Jiang et al, , 2018Ma et al, 2020), carbon fiber reinforced plastics (CFRP) (Hauschwitz et al, 2020), polycarbonatesheets (Alamri et al, 2018), etc. Figures 1i-k show an typical example of DLIP-enabled patterning on 2D materials, i.e.…”

Micromachining of Invar with 784 Beams Using 1.3 ps Laser Source at 515 nm

“…Therefore, new techniques for rapid large-scale processing are required. The most promising rapid large-scale techniques include polygonal scanning systems [ 15 , 16 ], direct laser interference patterning [ 17 , 18 ] and multi-beam scanning approaches [ 19 ].…”

Large-Beam Picosecond Interference Patterning of Metallic Substrates

“…Direct laser interference patterning (DLIP) provides a solution to these issues by overlapping two or more coherent laser beams on the surface to directly imprint an interference pattern. If enough pulse energy is used, a large variety of materials can be processed at interference maxima positions, including metals [ 16 , 17 , 18 ], dielectrics [ 19 , 20 ], and even composite materials [ 21 ]. This allows the patterning of an area on the order of several tens of µm in diameter in a single irradiation step and with resolutions below the diffraction limit of the initial beam.…”

“…However, micron-sized pattern periodicity requires lenses with a short focal length to reach a high enough angle between overlapping beams. Consequently, potential throughputs are limited by the diameter of interference area, which is often on the order of a few tens of microns [ 16 , 21 , 22 ].…”

“…In line with that, this research presents a simple method that can increase the interference area diameter and preserve the high-resolution structures at the same time without any change in the optical setup. In particular, the high beam quality, ultrashort pulse duration below 2 ps, and high pulse energy of a HiLASE Perla laser in a combination with a novel technique of enlarging the interference area within the boundaries of the laser system parameters are novel aspects compared to the more commonly applied two beam configurations [ 16 , 21 , 24 ]. By utilizing this method, high throughput fabrication of micron and sub-micron sized features is demonstrated on several metallic materials, including stainless steel, commonly used in industrial contexts, such as medical implants, precision mechanics, marine applications, and food handling; tungsten, with applications in the production of hard materials and coatings; and invar, used in electronics and precision mechanical systems where a high degree of dimensional stability is required under a wide range of temperatures.…”