Barannyk O. Quasi-optical dielectric resonators with elements of unusual superconductors

The object of study is oscillation processes in quasi-optical dielectric resonators (QDR) with unusual superconductors and the interaction of the electromagnetic field of the whispering gallery modes with unusual superconductors in the millimeter wavelength range. The aim of the study is to develop the fundamentals of the electrodynamics of QDR with elements of unusual superconductors in the mm wavelength range, to substantiate the possibility of studying the physical properties of films and single crystals of unusual superconductors using the microwave response of the QDR, and to establish the surface impedance properties of a number of unusual superconductors containing iron. The radiophysical research methods are used in this work for studying the response of QDRs with unusual superconductor elements. The scientific novelty of the study lies in the fact that, for the first time, a study was made of the spectral and energy characteristics of a number of QDRs with elements of unusual superconductors, namely hemispherical, conical, and aspherical resonators. On this basis, the possibility was substantiated and the individual microwave impedance characteristics of films of unusual superconductors (YBaCuO) were studied. The possibility was substantiated and the physical properties of unusual small size superconductors (pnictides and chalcogenides) were studied too. The field of application is radiophysics and physics of superconductivity.