1. Max Planck Institute for the Science of Light, Staudtstraße 2, 91058 Erlangen, Germany
2. University of Erlangen-Nürnberg, Staudtstraße 7/B2, 91058 Erlangen, Germany
3. Max Planck School of Photonics, Albert-Einstein-Str. 6, 07745 Jena, Germany
4. Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany
5. Fraunhofer Institute for Applied Optics and Precision Engineering, 07745 Jena, Germany
6. Institute of Solid State Physics, Friedrich Schiller University Jena, 07743 Jena, Germany