1. O. Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, Kharkiv 61085, Ukraine
2. National Academy of the National Guard of Ukraine, Kharkiv 61000, Ukraine
3. Research Center for Development of Far-Infrared Region, Fukui University, Fukui 910-8507, Japan
4. TeraVED Group, Inc., Tallin 10111, Estonia