1. Max Planck Institute for the Science of Light, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
2. Friedrich-Alexander-Universität
Erlangen-Nürnberg (FAU), Institute of Optics, Information and Photonics, Staudstr. 7/B2, 91058 Erlangen, Germany
3. Helmholtz Centre Berlin for Materials and Energy, Hahn-Meitner Platz 1, 14109 Berlin, Germany