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Preparation of LiNbO3 nanostructures and their characterization
Pikna, Štěpán ; Jelínek, Michal (referee) ; Dvořák, Petr (advisor)
This master thesis is focused on the deposition of LiNbO3 on c-cut Al2O3 substrate. This material exhibits an electro-optic effect, which refers to the change in the refractive index upon the application of an external voltage, and it has extensive applications in electro-optic modulators. Currently, there is significant interest in miniaturizing these devices for use in the fields of meta-optics and photonics, where its transparency is also advantageous. The first part of this thesis is dedicated to a review of the electro-optic effect and its application in optical metasurfaces. Subsequently, the review addresses the pulsed laser deposition of LiNbO3. The practical part begins with the optimization of target fabrication from LiNbO3 wafers using a laser cutter. Following this, the measurement of the electro-optic effect from a monocrystalline LiNbO3 wafer is discussed. The final section is devoted to the deposition of this material onto a sapphire substrate and further analysis using SPM, XPS, XRD, and SEM. Monocrystalline growth of 30 nm grains was observed, and the physical dependencies of the growth was studied.
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Opto-electronical measurement methods
Kvapil, Antonín ; Drexler, Petr (referee) ; Fiala, Pavel (advisor)
This thesis deals with the aspects of methods for power and elements of electric and magnetic field measurement. Analysis of methods are performed for measuring pulsed voltage, current and power electromagnetic puls in this thesis. The method and workplace for measuring power of electromagnetic field is designed. The measurement method has been experimentally realized.
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METHODS FOR MEASUREMENT OF ULTRA-SHORT SINGLE-SHOT ELECTROMAGNETIC PULSES
Drexler, Petr ; Fiala, Pavel (advisor)
This thesis deals with the aspects of methods for pulsed high-level EM quantities measurement. Methods for current and voltage measurement in pulsed power generator and power measurement in pulse microwave generator are discussed. New approaches to single-shot measurement methods application are proposed. The theoretical analysis of suitable sensor designs is performed. The magneto-optic measurement method has been experimentally realized. On the basis of experimental results a fiber-optic current sensor has been designed and theoretically analyzed. For identification and measurement of the free-space electromagnetic pulse a combined calorimetric sensor has been designed and built.
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METHODS FOR MEASUREMENT OF ULTRA-SHORT SINGLE-SHOT ELECTROMAGNETIC PULSES
Drexler, Petr ; Fiala, Pavel (advisor)
This thesis deals with the aspects of methods for pulsed high-level EM quantities measurement. Methods for current and voltage measurement in pulsed power generator and power measurement in pulse microwave generator are discussed. New approaches to single-shot measurement methods application are proposed. The theoretical analysis of suitable sensor designs is performed. The magneto-optic measurement method has been experimentally realized. On the basis of experimental results a fiber-optic current sensor has been designed and theoretically analyzed. For identification and measurement of the free-space electromagnetic pulse a combined calorimetric sensor has been designed and built.
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Opto-electronical measurement methods
Kvapil, Antonín ; Drexler, Petr (referee) ; Fiala, Pavel (advisor)
This thesis deals with the aspects of methods for power and elements of electric and magnetic field measurement. Analysis of methods are performed for measuring pulsed voltage, current and power electromagnetic puls in this thesis. The method and workplace for measuring power of electromagnetic field is designed. The measurement method has been experimentally realized.
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