Product Code: ICA10_M504

Fabrication of Hierarchical Microstructures on Metals by Means of Direct Laser Interference Patterning
Authors:
Matthias Bieda, Fraunhofer Institute for Material and Beam Technology; Dresden Germany
Andres Lasagni, Fraunhofer Institute for Material and Beam Technology; Dresden Germany
Eckhard Beyer, University of Technology Dresden, Institute for Surface and Production Technology; Dresden Germany
Presented at ICALEO 2010

We have studied the fabrication of hierarchical periodic microstructures on metals by means of Direct Laser Interference Patterning. A nanosecond pulsed Nd:YAG laser at 355 nm wavelength was used to produce the microstructures with grating periods ranging from 1 to 10 µm on stainless steel, titanium and aluminium. The results indicate that the geometrical characteristics of the interference patterns as well as the thermal properties of the substrates determine the quality of the fabricated structures. In particular, the best structures were obtained when the material at the interference minima position remained in the solid state and the temperature at the interference maxima is below the vaporization temperature. Thermal simulations by finite element method were carried out modelling photothermal interactions of the interference pattern with the metallic substrates to evaluate laser induced thermal effects, such as temperature distribution and temperature gradients, and thus enabling us to explain the obtained results.