1. Faculty of Physics and Center for NanoScience (CeNS), Ludwig-Maximilians-University, Geschwister-Scholl-Platz 1, 80539 Munich, Germany
2. Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701, United States
3. Zuse Institute Berlin, Takustraße 7, D-14195 Berlin, Germany
4. JCMwave GmbH, Bolivarallee 22, 14050 Berlin, Germany