1. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
2. Light Technology Institute, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
3. Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany