A.V. Averchenko – Post-graduate Student, Faculty of Physics, Department of Optics, Spectroscopy and Nanosystems Physics, Lomonosov Moscow State University

E-mail: aaverchenko93@gmail.com

A.M. Zotov – Ph. D. (Phys.-Math.), Senior Research Scientist, Faculty of Physics, Department of Optics, Spectroscopy and Nanosystems Physics, Lomonosov Moscow State University

E-mail: azotov@gmail.com

P.V. Korolenko – Dr. Sc. (Phys.-Math.), Professor, Faculty of Physics, Department of Optics, Spectroscopy and Nanosystems Physics, Lomonosov Moscow State University E-mail: pvkorolenko@rambler.ru