Lyaschuk Y. Phenomena of resonance interaction of electromagnetic waves with hybrid semiconductor plasmon structures: detection and amplification of terahertz radiation

The thesis is devoted to theoretical studies of effects of resonance excitation of plasmons in the low-dimensional electron gas interacting with microwave electromagnetic waves in the hybrid semiconductor plasmonic structures. In the particular, the effects of detection and amplification of terahertz radiation in the structures with drifting electron gas have been analyzed in details. The original design of the hybrid plasmon structure based on the InGaAs heterostructure with a drifting electron gas has been proposed to achieve Cherenkov’s-type plasma instability. The theory of detection of THz radiation in plasmonic structures with a drifting electron gas has been developed in the frame of the self-consistent solution of the system of the Maxwell's equations and the hydrodynamics equations. The measured reflectivity spectra of heavily doped n-GaN epitaxial layer with a surface etched diffraction grating have been explained for the spectral range of 2-20THz. It has been shown that the observed features of these spectra are explained by the excitations of surface plasmon polaritons and the diffraction phenomena.