National Repository of Grey Literature 16 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Metallic nanostructures with three-dimensional topography for plasmonics
Rovenská, Katarína ; Kvapil, Michal (referee) ; Ligmajer, Filip (advisor)
Due to high concentration of free electrons, metallic nanostructures can support plasmonic resonances. The spectral shape of plasmonic resonances may be tuned by many factors and because of it, the field of their application, given by their capability of focusing light under the diffraction limit, broadens. This thesis deals with fabrication of gold nanostructures by electron beam litography on top of a silicon substrate. The topography of the substrate is subsequentially modified by wet anistropic etching. A part of this thesis also briefly reviews methods for fabrication of nanostructures with planar or three-dimensional topography. Using the infrared spectroscopy, this thesis further analyzes the effect of size, shape, spacing of the nanostructures, and also the substrate topography on the optical response of the fabricated nanostructures. The outcomes of this thesis verify previously described tendencies of spectral relations between optical properties and named parameters in the mid-infrared region.
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).
Optical response of infrared plasmonic antennas in presence of silicon dioxide thin film
Biolek, Vladimír ; Dubroka, Adam (referee) ; Kvapil, Michal (advisor)
The diploma thesis deals with the optical response of resonant infrared antennas on silicon dioxide thin film. At first, theory of electromagnetism at metal/dielectric interfaces is described. In the next part, experimental and numerical methods used in the thesis are described and strong coupling between two systems is explained. In the final part of the thesis, the optical response of resonant infrared antennas on a silicon dioxide thin film is studied by Fourier transform Infrared Spectroscopy and FDTD simulations which both show the strong coupling between localized plasmons and phonons in silicon dioxide.
Scanning Near-field Optical Microscopy (SNOM)
Majerová, Irena ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
A study of the optical properties of 2D materials has recently been the focus of the broad scientific community for its possible applications in nanophotonics and plasmonics. This bachelor thesis deals with the detection of photoluminiscence (PL) of 2D material (MoS2) by means of near-field scanning optical microscopy (SNOM). This PL is excited in the far-field by means of a focused green laser and in the near-field by surface plasmon polariton (SPP) interference. MoS2 flake monolayers are prepared using micromechanical exfoliation on various functional substrates (metal and dielectric). Characterization and quality of MoS2 monolayers is controlled using Raman optical spectroscopy. Furthermore, the experimentally obtained optical spectra of PL MoS2 are compared in a far-field using confocal optical microscopy and in the near-field using SNOM device, where in the near-field is observed a 3 times higher intensity PL of this 2D material than in the far-field
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.
Preparation of SNOM probes with special properties
Hertl, Vít ; Kvapil, Michal (referee) ; Spousta, Jiří (advisor)
This bachelor thesis is focused on preparation and testing of probes from a hollow optical fibre and their application in SNOM measurement. Further, special properties of these probes are studied, namely their use as a "nanoGIS". The main problems as etching from the inside are assumed to be solved.
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.
Unidirectional plasmonic antennas
Formanová, Veronika ; Hrtoň, Martin (referee) ; Kvapil, Michal (advisor)
This thesis deals with directional V-shaped plasmonic antennas. In the thesis, an analytical model of antenna emission is proposed. The results of analytical computations are compared with results of numerical simulations in Lumerical FDTD Solutions package. Also, the process of fabrication of such antennas by electron beam lithography and measurement of optical properties using Fourier infrared spectroscopy is described and measured antenna resonant spectra are shown. Finally, there is a proposal of an experiment to prove the emission directivity of fabricated V-shaped antennas.
Localized Surface Plasmons: Principles and Application
Kvapil, Michal ; Schmidt, Eduard (referee) ; Šikola, Tomáš (advisor)
The diploma thesis deals with plasmonic nanostructures for visible eventually near-infrared region of electromagnetic spectrum. At first, there are discussed basic terms which are necessary for description of plasmonic nanostructures and their properties. Then the resonant properties of gold nanoantennas on a fused silica substrate and in proximity of nanocrystalline diamond are addressed. FDTD simulations are used for an assesment of resonant properties and local electric field enhancement of these nanostructures. Possible manufacturing methods of the antennas and techniques for the measurement of their properties are mentioned at the end of the thesis.
Deposition of Indium Tin Oxide and study of its optical properties
Olivíková, Gabriela ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
This work is focused on preparation and deposition of thin layers of indium tin oxide (ITO) by ion beam sputtering (IBS) and ion beam assisted deposition (IBAD). In the theoretical part, the electrical and optical properties, preparation methods, and applications are reviewed. In the experimental part, the optical and transport properties of deposited films are investigated by spectroscopic methods. It is shown that simultaneous bombardment of the surface with oxygen ions with energy 80 eV results in increase of transmittance in the visible range of spectrum. IBAD thus confirmed as a suitable method for modification of optical properties.

National Repository of Grey Literature : 16 records found   1 - 10next  jump to record:
See also: similar author names
3 Kvapil, Martin
2 Kvapil, Matouš
2 Kvapil, Matěj
2 Kvapil, Mikuláš
3 Kvapil, Milan
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