1. Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Saratov Branch, Saratov 410019, Russia
2. Saratov State University, Saratov 410012, Russia
3. Laboratory “Metamaterials,” Saratov State University, Saratov 410012, Russia
4. Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Moscow 125009, Russia
5. National Academy of Sciences of Belarus, Scientific-Practical Materials Research Center, Minsk 220072, Republic of Belarus
6. “Terahertz Spintronics” Laboratory, Moscow Institute of Physics and Technology (State University), Dolgoprydny, Moscow Region 141700, Russia