1. Nanostructuring, Nanoanalysis and Photonic Materials Group Department of Physics Paderborn University 33098 Paderborn Germany
2. Center for Optoelectronics and Photonics Paderborn (CeOPP) 33098 Paderborn Germany
3. Institute of Lightweight Design with Hybrid Materials (ILH) 33098 Paderborn Germany
4. Technical and Macromolecular Chemistry Dept. of Chemistry Paderborn University 33098 Paderborn Germany
5. Institute of Materials and Nanotechnology Universidad de La Laguna Santa Cruz de Tenerife 38206 Spain