|
|
Interaction of metallic nanoparticles and fast electrons
Konečná, Andrea ; Tyc, Tomáš (referee) ; Dub, Petr (advisor)
Scanning transmission electron microscopy is one of the essential techniques suitable not only for imaging of nanostructures, but also for various kinds of spectroscopy and, as it was recently demonstrated, nanomanipulation. In this thesis, we deal with an interaction of fast electrons and metallic spherical nanoparticles, specifically aluminium and gold nanospheres. First, we present both analytical and numerical calculations of electron energy loss spectra and their analysis for different parameters. The main part of the thesis is devoted to theoretical calculations of forces acting on the nanosphere due to the electron passing in its close proximity. Based on our novel results revealing a time evolution of the mechanical force, we also propose a possible mechanism responsible for the nanoparticle movement in electron microscopes.
|
|
| |
|
|
In the Forrest
Pucharová Kramářová, Vendula ; Dub, Petr (referee) ; Lahoda, Tomáš (advisor)
My work began with taking photos in the forest at night; this work was very important to me because of the mysterious feeling. My paintings are stylized more than realistic. I'm captivated by untidy nature, with fallen trees and decaying stumps. Oil is my medium- some places are detailed while others are expressive.
|
|
|
Detection of Localized Surface Plasmons on Metal Nanostructures
Konečná, Andrea ; Dub, Petr (referee) ; Kalousek, Radek (advisor)
This bachelor's thesis deals with theoretical and experimental study of localized surface plasmons excited on metal nanostructures. Analytical calculations were compared to simulations and measurements using assembled apparatus and Fourier-transform infrared spectroscopy (FT-IR) in infrared range. Obtained results were discussed considering both validity of performed approximations and quality of manufactured nanostructures.
|
|
| |
|
|
Mathematical pendulum
Kučerová, Barbora ; Dub, Petr (referee) ; Franců, Jan (advisor)
This bachelor’s thesis deals with the mathematical modeling of the behaviour of mathematical pendulum. The aim of this thesis is to find the equation of mathematical pendulum, compute the trajectories of solution and interpret their meaning, clasify the singular solution, plot the phase portrait in MATLAB software for the basic model and for the generalized model of the damped and driven pendulum.
|
|
| |
|
|
Physics of Metamaterials
Láska, Martin ; Kalousek, Radek (referee) ; Dub, Petr (advisor)
The bachelor work deals with electrodynamics of metamaterials for which both the electric permittivity and magnetic permeability are simultaneously negative. It is shown that the double negative media are described by a negative refraction index which has an important impact on optics laws. In particular, the negative refraction is demonstrated by simulation of interaction of the Gauss monochromatic beam impinging on a negative refractive material. Next, the electromagnetic energy propagation in the negative refractive materials is studied. It is shown that the energy propagation velocity equals the group velocity, which has the opposite sign than the phase velocity. Finally, Fresnel formulas valid both for positive and negative refraction index are given.
|
|
|
Modelling of Local Plasmon Resonances
Dvořák, Petr ; Dub, Petr (referee) ; Kalousek, Radek (advisor)
This Bachelor’s thesis is dedicated to plasmon resonance systems. The first part deals with the analytical and numerical description of behaviour of the surface plasmon polaritons in the edge proximity of metal antennas. The second part is devoted to the simulations of dispersion of light on Ga cap deposited on Si substrate. Possibilities of measurements of the resonance with the SNOM method is mentioned at the end.
|
|
|
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.
|
guest ::
RSS feed.