А.V. Kozar - Professor, Department of photonics and microwave physics, M.V. Lomonosov Moscow State University. E-mail: avk@phys.msu.ru А.V. Trofimov - Post-graduate Student, Department of photonics and microwave physics, M.V. Lomonosov Moscow State University. E-mail: av.trofimov@physics.msu.ru