1. Department Functional Interfaces Leibniz Institute of Photonic Technology Jena (IPHT) Albert-Einstein-Straße 9 07745 Jena Germany
2. Department of Inorganic Chemistry I University of Ulm Albert-Einstein-Allee 11 89081 Ulm Germany
3. Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
4. Pascher Instruments AB Stora Råby Byaväg 24 S-224 80 Lund Sweden