Direct Fabrication of Periodic Structures on Surfaces

Abstract

land. He has been award with the Fritz-grasenick prize 2007 and the Werner Köster prize 2006 for his work related with FiB-Tomography and Laser processing, respectively. After a postdoctoral stage at the georgia institute of Technology and the University of michigan (Alexander von Humboldt Fellowship), he joined the Fraunhofer iWS where he is currently the head of the Surface Functionalization group. The AuThorS This report introduces a recently developed method for the direct fabrication of 2D and 3D structures. The technique involves the modulation of the laser beam intensity by generating interference patterns. By using high power lasers it is possible to directly modify the material's surface obtaining micro-and submicrometer periodic arrays with controlled spatial modulation. Some examples of fabricated structures on metals, polymers as well as ta-C layers are discussed.

Efficiency Enhancement of Organic Solar Cells by Fabricating Periodic Surface Textures using Direct Laser Interference Patterning

“…This approach requires only a single processing step without solvents or heating. [23][24][25] Similarly to LIL, in DLIP, two or more coherent laser beams are brought to interference with each other on a substrate. Due to the periodic variation of the light intensity and the ability of the sample material to absorb the laser light, different one-and two-dimensional periodic patterns can be produced by direct ablation of the substrate without using any masks or templates, resulting in spatial periods ranging from some hundreds of nanometers up to several micrometers.…”

Direct Laser Interference Patterning of Nickel Molds for Hot Embossing of Polymers

“…A method capable to afford simultaneously high resolution and low-cost processing is direct laser interference patterning (DLIP). [4,5] In DLIP, two or more laser beams are guided to overlap on the substrate by using different optical elements. This leads to the formation of a periodic variation of the laser energy, where the material is photo-thermally or photochemically ablated at the interference maxima positions, thereby creating a periodic pattern.…”

Two-beam interference patterning of biodegradable magnesium alloy: Influence of number of passes and spots overlap

“…However, these materials show critical aspects due to high reactivity, low melting temperature, and high thermal conductivity. 33,34 The periodic structure formation can be a) Electronic mail: valentina.furlan@polimi.it obscured due to high melt fraction and surface oxidation within the process.…”