EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

Using UV-laser processing methods, multi-scaled micro/-nanostructured polycarbonate polymer surfaces were produced. The developed strategy includes the utilization of the Direct Laser Interference Patterning (DLIP) method for creating grating and pillar-like geometries in the microscale as well as the fabrication of Laser-induced Periodic Surface Structures (LIPSS) with features sizes of a few nanometers, to ultimately develop hierarchical micro- and nanometer surface structures. An important parameter controlling the morphology of the periodic features was the direction of the laser beam polarization with respect to the DLIP treated surfaces. Scanning electron and atomic force microscopy methods were used for the characterization of the hybrid surface structures and finite-difference time-domain (FDTD) calculations of the laser intensity distribution on the DLIP structures allowed to address the specific polarization dependence of the LIPSS formation observed in the second processing step. Chemical analyzes of the laser treated surfaces were performed by micro-Raman spectroscopy and attenuated total reflection Fourier-transform infrared spectroscopy.