1. ETH Zurich, Optical Nanomaterial Group Institute for Quantum Electronics Department of Physics Auguste‐Piccard Hof 1 Zurich 8093 Switzerland
2. ITMO University Faculty of Physics and Engineering Kronverkskiy Prospect 49 St. Petersburg 197101 Russia
3. Saint Petersburg State University University Embankment, 7/9 St. Petersburg 199034 Russia
4. Saint Petersburg Academic University Ul. Khlopina 8/3 St. Petersburg 194021 Russia