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SNOM probes with special properties
Slabý, Vít ; Kalousek, Radek (referee) ; Spousta, Jiří (advisor)
This bachelor thesis deals with scanning near-field optical microscopy. With SNOM we examined experimentally the near field of the interference of surface plasmon polaritons (PPP) on plasmonic structures consisting of slits in a metal layer a we discuss the effect of probe characteristics on the measurement results.Effect of few characteristics is simulated numerically. Findings obtained in the previous experiments are used for the construction designing of an experimental device called NanoGIS, which should serve for the nanostructure manufacturing.
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Study of Optical Properties of Metallic Structures and Their Applications in Nano-Optics
Neuman, Tomáš ; Munzar,, Dominik (referee) ; Kalousek, Radek (advisor)
Interaction of metallic structures with electromagnetic radiation is a living topic of near-field optics including plasmonics and nanophotonics. The field-matter interaction treated on the subwavelength scale opens the path to a wide range of applications, among others to different variants of the surface enhanced spectroscopy. In this thesis we theoretically describe how the near-field properties of the metallic structures can be accessed by a probe of near-field scanning optical microscope. Formation of the signal in the near-field microscopy utilizing weakly interacting probes is discussed. Further, we elucidate the mechanism of the surface enhanced infrared spectroscopy. We utilize a model example of linear dipole antennas interacting with sample structures. A close connection is found between the spectroscopic signal and signal of the scattering type near-field optical microscopy.
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Development of UHV STM/AFM
Pavelec, Jiří ; Neuman, Jan (referee) ; Kalousek, Radek (advisor)
The main focus of the thesis is on the actuator, which is used for nanopositioning of laser beam in-site AFM (Atomic Force Microscopy). The appropriate shape of supply pulse and frequencies were searched and optimized. They make slip-stick motion of the piezo actuator. Possibilities of solving troubles with UHV (Ultra High Vacuum) are described on the basis of experiment and simulation.
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Controlling of Nanostructure Temperature by Light Absorption
Kovács, Roland ; Schmidt,, Eduard (referee) ; Kalousek, Radek (advisor)
The thesis deals with a new versatile strategy which is aimed to heat up rapidly the nanostructures with the help of a focused light beam utilizing localized plasmons (collective oscillation of electrons). By local heating, the growth of the semiconductor nanowires can be initiated and controlled at any arbitrarily prespecified location down to the single nanostructure level in a chamber at room-temperature. The aim of the work is to study electromagnetic field in the selected structures, especially in metal nanospheres by using numeric calculations and computations of the thermal field in the vicinity of these illuminated nanostructures. Electromagnetic phenomena is simulated in Lumerical and the temperature field in COMSOL.
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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.
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Analysis of advanced materials and structures by SIMS method
Holeňák, Radek ; Kalousek, Radek (referee) ; Bábor, Petr (advisor)
Bachelor theasis deals with the study of advanced materials by SIMS method and the possibilities of kvantitative analysis using maesured data. Chemical analysis of the ceramic surface in order to optimize the measurement conditions was performed. The rest of the work uses the data output from the measurement to describe the internal microstructure of the material. Using sophisticated methods, Si precipitates in the AlSi layer are localized and described, and the formation of the MgAl2O4 phase in ceramic samples is confirmed. Achieving all the set goals reveals the potential of the SIMS method and, above all, the possibility of processing the data output from the measurements.
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Modeling of Surface-Plasmon Propagation in Graphene
Hrtoň, Martin ; Munzar,, Dominik (referee) ; Kalousek, Radek (advisor)
The diploma thesis provides an introduction to electronic and optical properties of graphene, emphasizing thier tunability through the ambipolar field effect. Furthermore, an experiment, which would demonstrate the possible utilization of graphene in active plasmonics, is presented. The author focuses on light scattering simulations involving hybrid plasmonic structures made of noble metals and graphene. The scattering properties of those structures and their dependence on the density of free charge carriers in graphene are investigated. The author concludes that the proposed tuning of the response of a single metallic antenna through the electrostatic doping of graphene proves to be inefficient, and a more elaborate configuration will be required to enhance the effect and achieve the desired control.
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Study of Properties of Surface Plasmon Polaritons on Magnetic Materials
Dvořák, Petr ; Schmidt, Eduard (referee) ; Kalousek, Radek (advisor)
The diploma thesis deals with the experimental study of surface plasmon polaritons (SPPs) on nano-structures with the Au/Co/Au multilayer. Plasmonic structures were prepared by the electron beam lithography and by the focused ion beam. A Scanning optical near-field microscope was used for detection of surface plasmon polaritons. SPPs were confirmed by the experiment with different polarizations of the illuminating light. Furthermore, differences in plasmon interference wavelengths was measured for different surface dielectric functions. Finally, the decantation of the SPPs interference image was measured in dependence on the external magnetic field.
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