1. Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
2. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
3. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
4. Laboratory Metamaterials, Saratov State University, Saratov 410012, Russia
5. Kotel’nikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, Moscow 125009, Russia
6. Department of Materials, Laboratory for Mesoscopic Systems, ETH Zürich, 8093 Zürich, Switzerland