1. Institute of Physical Chemistry Friedrich Schiller University Jena Lessingstr. 10 07743 Jena Germany
2. Abbe Center of Photonics Albert‐Einstein‐Straße 6 07745 Jena Germany
3. Central Facility of Materials Science Electron Microscopy Ulm University Oberberghof 3/1 D‐89081 Ulm Germany
4. Institute of Applied Physics Friedrich Schiller University Albert‐Einstein‐Str. 15 07745 Jena Germany
5. Institute of Solid State Physics Friedrich Schiller University Max‐Wien‐Platz 1 07743 Jena Germany
6. Cavendish Laboratory University of Cambridge JJ Thomson Avenue Cambridge CB3 0HE UK
7. Leibniz Institute of Photonic Technology (IPHT) Albert‐Einstein‐Str. 9 07745 Jena Germany
8. Fraunhofer‐Institute for Applied Optics and Precision Engineering IOF Albert‐Einstein‐Str. 7 07745 Jena Germany