1. University of Applied Science Jena, SciTec Department, Carl-Zeiss-Promenade 2, 07745 Jena, Germany
2. Technische Universität Ilmenau, Department of Mathematics and Natural Science, Institute for Physics, Group of Technical Physics I, P. O. 10 05 65, 98694 Ilmenau, Germany
3. INNOVENT e.V., Department of Surface Engineering, Prüssingstr. 27B, 07745 Jena, Germany