A.M. Bobreshov – Dr.Sc.(Phys.-Math.), Professor, Head of Department of Electronics, Dean of Faculty of Physics,

Voronezh State University

E-mail: bobreshov@phys.vsu.ru

I.S. Korovchenko – Ph.D.(Phys.-Math.), Associate Professor, Department of Electronics, Voronezh State University E-mail: korovchenko@phys.vsu.ru

A.V. Oleinikov – Post-graduate Student, Voronezh State University E-mail: ozverinka@gmail.com