National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Studium a využití povrchových plazmonů v terahertzové spektrální oblasti
Darebník, Peter ; Kužel, Petr (advisor) ; Postava, Kamil (referee)
Title: Study and application of surface plasmons in terahertz spectral range Author: Peter Darebník Department: Department of Chemical Physics and Optics Supervisor: doc. RNDr. Petr Kužel, Dr., department of Chemical Physics and Optics - external employee Abstract: The goal of this thesis is analytical, numerical and experimental study of surface plasmons in terahertz spectral range The description of the surface plasmon propagation along metal/dielectric interface can be done purely analytically. Our goal is to obtain the description of the surface plasmon propagating in more complex dielectric layered structures which are in contact with metallic layer. Analysis of the surface plasmon dispersion curves in anisotropic layered structure was done numerically. Existing transmission terahertz spectroscopy experiment was expanded by an arrangement that allows us to excite the surface plasmon on the metallic layer and allows us to measure its characteristics after the transmission of samples, that are in contact with this layer. Obtained theoretical and experimental data were then evaluated, so we could conclude to which extent can the surface plasmon be used for spectroscopic purposes in terahertz range. We concluded, that we were able to describe surface plasmons in layered structures including anisotropic...
Investigation of transport phenomena in GaAs/AlGaAs based materials for measurements of the spin Hall effect
Darebník, Peter ; Němec, Petr (advisor) ; Reichlová, Helena (referee)
Title: Investigation of transport phenomena in GaAs/AlGaAs based materials for measurements of the spin Hall effect Author: Peter Darebník Department: Department of Chemical Physics and Optics Supervisor: doc. RNDr. Petr Němec, Ph.D. Abstract: The content of this thesis is the study of transport phenomena in semiconducting structures based on GaAs/AlGaAs. These heterostructures are nowadays widely used for the study of the spin Hall effect, which can be partly considered a transport phenomenon, and it is therefore important to know the transport characteristics of these structures. We will mainly be focusing on electron/hole mobility since this parameter characterizes the scattering rate in the studied material. Our goal is to determine how the mobility will change at different temperatures in a system, which dimensions are comparable to the mean free path of electrons. Part of this thesis is dedicated to theoretical description of the studied phenomena and to the description of manufacturing technology of aforementioned heterostructures. Keywords: electron, spin, Drude model, 2DEG, GaAs/AlGaAs heterostructures

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