National Repository of Grey Literature 47 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Preparation of optical thin films by chemical vapor deposition
Koryčánek, Adam ; Kvapil, Michal (referee) ; Kolíbal, Miroslav (advisor)
This work is focused on the comparison between physical vapor deposition methods of thin antireflective layers and chemical vapor deposition (CVD) methods, for applications in the field of optics. The work begins with basic concepts and principles related to anti-reflective coatings, their deposition and characterization. Furthermore, in the experimental part, the techniques of ellipsometry, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) are used to characterize the properties of the layers and their comparison.
Experimental measurement of dielectric functions using ellipsometry
Slovák, Radim ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This work deals with the broad application of the spectral ellipsometry (SE) characterization method. It includes measurements of the dielectric function of thermal SiO2 and its thickness on a silicon substrate. Additionally, it presents diverse dielectric function of thin gold layer, highlighting its metallic and dielectric properties. The SE method is utilized for determining time-variable layers such as the growth rate of copper oxides. Furthermore, the dielectric function of the photoluminescent material CsPbBr3 is measured to identify quantum transitions within this perovskite material. Finally, a program in python is developed, enabling comprehensive analysis of ellipsometric data obtained via imaging microellipsometry on phase-change Sb2S3.
Design of metasurfaces for advanced optical elements
Březina, Tomáš ; Kvapil, Michal (referee) ; Hrtoň, Martin (advisor)
Metasurfaces represent an intriguing class of materials with a wide range of promising applications, one of them being advanced planar optical elements for industrial production and imaging. The main goal of this thesis is to design such an optical element, namely a beam-shaper consisting of dielectric anostructures in HCTA (high constrast transmitarray) arrangement. The first part of this work introduces a simplified theoretical model of the optical response of building blocks that facilitates understanding of the basic functional mechanism behind the phase metasurfaces. To quantify the optical response of dielectric building blocks with enough precision, numerical FDTD simulations were employed. As a result, a database compatible with lithographic fabrication procedures was created. To find the phase distribution ensuring the desired beam-shaping function, two approaches were investigated and implemented: the semi-analytical method of geometric transformation and the iterative Gerchberg-Saxton algorithm. The final output of this work is then the distribution of building blocks within the metasurface that imprints into the impinging beam the previously calculated phase profile.
Fabrication and characterization of plasmonic nanostructures
Bačo, Ondřej ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This bachelor thesis deals with fabrication and characterization of plasmonic nanostructures. Graphene on a doped silicon substrate with a 285 nm thick layer of silicon dioxide was used for fabrication of these structures. Graphene ribbons with width in the order of hundreds of nanometers were prepared using electron beam lithography (EBL) and reactive ion etching (RIE). Steps in fabrication process were monitored utilizing optical and atomic force microscopy (AFM). Prepared graphene nanostructures were characterized with scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR).
Numerical optimization of absorption of mid-infrared plasmonic structures
Kulič, Martin ; Křápek, Vlastimil (referee) ; Kvapil, Michal (advisor)
Plasmonic nanostructures have a long and rich history in spectroscopy and sensing. First, we look at the history and applications of plasmonic structures and we discuss the parameters that influence the enhancement of various methods. Then the influence of plasmonic nanostructures on energy absorption in a thin layer of silicon oxide, silicon nitride and silicon-rich oxynitride of varying thickness is probed using Lumerical FDTD Solutions software. The last part of this thesis focuses on numerical demonstration of application of plasmonic antennas in spectroscopy.
Optical properties of infrared plasmonic antennas fabricated by FIB technique
Biolek, Vladimír ; Dvořák, Petr (referee) ; Kvapil, Michal (advisor)
The bachelor thesis deals with plasmonic nanostructures for mid-infrared region of electromagnetic spectrum. In the first part, there are discussed theoretical description of electromagnetic field and description of properties of plasmonic nanostructures. Then the manufacturing methods of the plasmonic nanostructures for mid-infrared region of electromagnetic spectrum are discussed using focused ion beam, and measurement of these nanostructures are discussed using Fourier transform-infrared spectroscopy.
Plasmonic Antennas
Kvapil, Michal ; Brzobohatý, Oto (referee) ; Novák, Stanislav (referee) ; Šikola, Tomáš (advisor)
Tato disertační práce pojednává o plazmonických anténách. Rezonanční vlastnosti plazmonických antén jsou studovány teoreticky i experimentálně. Teoretické výpočty jsou prováděny v programu Lumerical FDTD Solutions užitím numerické metody konečných diferencí v časové doméně. Pro experimentální studium byly antény vyrobeny pomocí elektronové litografie. Rezonanční vlastnosti vyrobených antén jsou studovány fourierovskou infračervenou spektroskopií. Práce se zaměřuje na studium rezonančních vlastností antén vyrobených na vrstvě nanokrystalického diamantu. Dále zkoumá možnost využití antén jako plazmonického senzoru funkcionalizovaného k detekci streptavidinu. Nakonec je představena anténa tvaru písmene V, u které dochází v důsledku porušení symetrie antény ke směrovému rozptylu dopadajícího světla. Tato směrovost se ovšem projevuje jen na vlnových délkách blízkých kvadrupólovému módu antény.
Implementation of production hall gross superstructure
Kvapil, Michal ; Kučera, Zdeněk (referee) ; Kantová, Radka (advisor)
Writing of this bachelor thesis was stimulated by the construction of a new production hall in my hometown. It had been a long time since a similar project was dealt with in this town, and therefore it aroused my interest. The bachelor thesis includes the description and technical documentation for the construction of the reinforced concrete building frame of the production hall of the M&T company in Dobruška. The aim of this thesis is to solve the method and potential problems of the construction. I focused on the ceiling of the administrative part of the building. Contrary to the original technical documentation, I suggested cheaper and more time-saving solution of the ceiling: using the prestressed hollow core slab SPIROLL instead of the reinforced concrete composite floor slab FILIGRAN and concreting of the ceiling. I suggested this solution on the basis of my personal experience with the implementation of various types of the ceiling, and the subsequent analysis of their advantages and disadvantages. My suggested solution of the ceiling caused the reduction of this stage’s costs by 13% and the time reduction by 71% of working time. The other aim of this thesis was to solve the problems with the excessive and oversize transportation of the reinforced concrete roof trusses. In the end, these transportation problems together with the financial aspects resulted in the revision of the original technical documentation. The investor decided for the less demanding solution of the construction and for the shorter span of the hall. As for the concreting machinery, I suggested to use the machines (mixer truck and mobile concrete pump) from the nearby concrete plant to reduce the total transportation costs. The main contribution of the bachelor thesis is acquaintance with the construction of the reinforced concrete building frame and with practical verification and comparison of two different solutions of one construction with respect to the financial and time investments
Plasmonic Resonant Antennas
Kvapil, Michal ; Dub, Petr (referee) ; Tomanec, Ondřej (advisor)
In the first part, using of nano- and microparticles in the plasmonics as well as the possibility of measurement resonant spectra of metallic nanostructures by photoluminescence are discussed. The main part of the work is focused on testing the possibility of using software Lumerical FDTD Solution 5.1.3 to simulate near field enhancement in the vinicity of plasmonic resonant antennas. Finally the results of simulations and analytical computation are confronted.
Architectural and technological project Residence Na Plachtě
Kvapil, Michal ; Kolečkářová, Barbara (referee) ; Kantová, Radka (advisor)
Writing of this master thesis was stimulated by my participation on compulsory practice and the level of its interest. The master thesis includes the description and technical documentation for the construction of the reinforced concrete building foundations. The aim of this thesis is to solve the method and potential problems of the concreting. As for the concreting machinery, I suggested to use the machines (mixer truck and mobile concrete pump) from the nearby concrete plant to reduce the total transportation costs. I’ve made an analysis of machine renting fees and price of fresh concrete between local distributors. The main contribution of the master thesis is acquaintance with the construction of the apartment building and with a practical side of preparations before the construction begins.

National Repository of Grey Literature : 47 records found   1 - 10nextend  jump to record:
See also: similar author names
6 KVAPIL, Martin
6 Kvapil, Martin
2 Kvapil, Matouš
4 Kvapil, Matěj
2 Kvapil, Mikuláš
3 Kvapil, Milan
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