1. Leibniz Institute of Photonic Technology Jena (IPHT); Albert-Einstein-Straße 9 07745 Jena Germany
2. Chair of Materials for Electrical Engineering; Institute of Materials Science and Engineering Institute of Micro and Nanotechnology MacroNano; Technische Universität Ilmenau; Gustav-Kirchhoff-Str. 5 98693 Ilmenau Germany
3. Institute of Physical Chemistry and Abbe Center of Photonics; Friedrich Schiller University Jena; Helmholtzweg 4 07743 Jena Germany
4. Institute of Geosciences; Friedrich Schiller University Jena; Carl-Zeiss-Promenade 10 07745 Jena Germany