Kosiak O. Quasioptical polarization converters of terahertz range

The object of research is the physical processes of interaction of polarized electromagnetic waves with anisotropic structures. The purpose of the work is to determine the physical laws and features of the construction of quasi-optical polarization converters on the basis of artificial birefringence structures in the terahertz frequency range and to develop practical recommendations for their development and application. The following research methods are used in the work: numerical method of integral functionals in the frequency domain for a multimode scattering problem; modified matrix method; standard waveguides and original quasi-optical methods for measuring the amplitude-phase and polarization characteristics of the scattering of electrodynamic structures. For the first time the work of the birefringent structure in the THz range is considered, methods for matching the structures with the help of elements of the structure itself are proposed, tunable and broadband quarter-wave and half-wave differential phase sections are proposed and implemented. The practical results are the creation and experimental study of the broadband rotator of the polarization plane and the polarization phase shifter. The results of the author's research can be used while creating the ellipsometers of the THz frequency range, microcompact polygons, phase shifters and frequency shifters of the THz range, in the development of radio measuring equipment and components of systems of general and special applications.