S.V. Bozhokin – Ph.D.(Phys.-Math.), Associate Professor, 

Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St. Petersburg Polytechnic University E-mail: bsvjob@mail.ru

K.A. Barantsev – Ph.D.(Phys.-Math.), Associate Professor, 

Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St. Petersburg Polytechnic University E-mail: kostmann@yandex.ru

A.N. Litvinov – Ph.D.(Phys.-Math.), Associate Professor, 

Institute of Physics, Nanotechnology and Telecommunications of Peter The Great St. Petersburg Polytechnic University E-mail: andrey.litvinov@mail.ru