Student Upscaling potential and industrial-suitability of scanner-based Direct Laser Interference PatterningThursday (25.06.2020) 11:10 - 11:30 Room 2
In nature, functional microstructures can be found on animals and plants in various shapes and sizes. The resulting effects show superhydrophobicity (e.g. lotus leaf), modified drag properties (e.g. shark skin) or decorative effects (e.g. morpho butterfly) [1, 2]. In order to take advantage of these effects on technical surfaces, strong requirements from the industry must be fulfilled. In addition to the capability of producing structures with small feature sizes in the nano- and micrometer range, an important criterion for the economic fabrication of functional microstructures is the necessity to reach high processing throughputs. A technology capable to generate well-defined microstructures on numerous surfaces is Direct Laser Interference Patterning (DLIP).
In DLIP, a laser beam is split into two or more partial beams which are then superimposed at the material surface, producing an interference pattern which is transferred to the part and thus introducing a periodic micro-pattern which can lead to distinct functionalities.
In this work, the interference principle is utilized in combination with a galvanometer scanner approach to generate line-like, cross-like and dot-like structures with spatial periods ranging from 2.4 to 15.0 µm on metal substrates (left panel of Figure 1). By carefully selecting the process parameters, microstructures with aspect ratios even greater than 1 can be achieved which is fundamental to obtain superhydrophobic effects on metals . The combination of the scanner-based DLIP approach with low-power ultra-short laser sources (< 30 W) result in impressive process throughputs of 250 cm²/min. The effectiveness of the approach is discussed by means of decorative surfaces (varying diffractive colors) as well as in terms of its suitability on 3D surfaces.
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