1. Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner Platz 1, 14109 Berlin, Germany
2. Max Planck Institute for the Science of Light, Staudtstrasse 2, 91058 Erlangen, Germany
3. Jacob
Blaustein Institutes for Desert Research, Sede Boqer Campus, Ben-Gurion University of the Negev, 8499000 Sede Boqer, Israel
4. Institute
of Optics, Information and Photonics, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Staudtstrasse 7/B2, 91058 Erlangen, Germany
5. Physics
Department, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany