1. Institute of Applied Physics Abbe Center of Photonics, Friedrich‐Schiller‐University Albert‐Einstein‐Straße 15 07745 Jena Germany
2. Institute for Condensed Matter Physics Technical University of Darmstadt Hochschulstr. 6 64289 Darmstadt Germany
3. Institute of Physical Chemistry Friedrich Schiller University Lessingstraße 10 07743 Jena Germany
4. Micro‐ and Nanostructured Optics Fraunhofer‐Institute for Applied Optics and Precision Engineering (IOF) Albert‐Einstein‐Straße 7 07745 Jena Germany
5. Max Planck School of Photonics Hans‐Knöll‐Straße 1 07745 Jena Germany
6. Institute of Solid State Physics Friedrich‐Schiller‐University Helmholtzweg 3 07743 Jena Germany