Differential phase sections based on form birefringence effect operating in the terahertz frequency range

Application of the differential phase sections (DPS) created on the form birefringence effect in long-wave part of the THz frequency range is considered. The limits of applicability of the analytical method of calculation and the method of integral functionals in frequency domain for full wave problem of dispersion have been defined for such quasioptical structures. The matched conditions have been considered. The experimental investigations of the DPS have been carried out.