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Preparation and characterization of SNOM probes
Robešová, Magdaléna ; Rovenská, Katarína (referee) ; Dvořák, Petr (advisor)
This Bachelor’s thesis is about the preparation of precision probes for Scanning Nearfield Optical Microscopy (SNOM) and its characteristics. Since SNOM probes influence the near electromagnetic field, the quality of their construction and their exact description is a key element for the valuable interpretation of measured data. The goal of this thesis is to grant literature research about SNOM, SNOM probes and their preparation process. Secondly, to produce and characterize the functional SNOM probes, which could then be used to detect optical interferences of Surface Plasmon Polaritons (SPPs).
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Plasmonically active nanostructures for optical filtering
Idesová, Beáta ; Liška, Jiří (referee) ; Rovenská, Katarína (advisor)
This bachelor’s thesis deals with optical color filters composed of plasmonically active nanostructures and studies the parameters which influence the performance of such filters. Using electron beam litography and selective reactive ion etching, plasmonic hole-like filters were prepared in alumina film on fused silica substrate. The fabricated arrays of nanostructures, acting as optical filters, varied in shape and size of the nanostructures, distances among the nanostructures and their lateral arrangement within the arrays. The influence of these factors on transmission spectra of plasmonic filters was experimentally analysed using optical spectroscopy. A majority of the observed alternations of the measured transmission spectra was consistent with the research study which is, as well, part of this thesis. The highest color filtering selectivity was observed in arrays with divided square structure shape which also exhibited decent transmittance.
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Dielectric metasurfaces as modern optical components
Rovenská, Katarína ; Kolařík, Vladimír (referee) ; Ligmajer, Filip (advisor)
Vďaka ich vysokej verzatilite a nízkej priestorovej náročnosti sú metapovrchy sľubným nasledovníkom tradičných optických komponentov. Táto práca sa upriamuje na metapovrchy, ktoré môžu nahradiť polvlnné doštičky a difraktívne deliče zväzku. Práca prezentuje dve stratégie výroby nanoštruktúr z oxidu titaničitého s vysokým pomerom strán -- jedna používa reaktívne iónové leptanie vrstvy TiO2 skrz kovovú masku, kým druhá používa štrukturovaný elektrónový rezist ako formu pre depozíciu atomárnych vrstiev TiO2. V závere práce sú charakterizované a analyzované optické vlastnosti vyrobených štruktúr, predovšetkým ich fázový posun a transmisivita.
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Fabrication and structuring of a thin vanadium dioxide layer for nanophotonics
Spousta, Jiří ; Musálek, Tomáš (referee) ; Rovenská, Katarína (advisor)
Vanadium dioxide is becoming frequently used in tunable metasurfaces, mainly due to its easily achievable insulator to metal phase-transition, occuring at around 67°C. This thesis deals with the optimization of thin VO2 layer fabrication process and specifically with e-beam evaporation and ion beam-assisted sputtering. The phase change of VO2 layers was optically characterized -- mostly, we measured the thermally-dependent transmissivity of our layers. In ion beam-assisted sputtering, we implemented a new process for yielding thin VO2 layers which uses in situ annealing during the deposition. Layers fabricated with this newly implemented process demonstrate a clear phase transition typical for VO2.
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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.
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Fabrication and structuring of a thin vanadium dioxide layer for nanophotonics
Spousta, Jiří ; Musálek, Tomáš (referee) ; Rovenská, Katarína (advisor)
Vanadium dioxide is becoming frequently used in tunable metasurfaces, mainly due to its easily achievable insulator to metal phase-transition, occuring at around 67°C. This thesis deals with the optimization of thin VO2 layer fabrication process and specifically with e-beam evaporation and ion beam-assisted sputtering. The phase change of VO2 layers was optically characterized -- mostly, we measured the thermally-dependent transmissivity of our layers. In ion beam-assisted sputtering, we implemented a new process for yielding thin VO2 layers which uses in situ annealing during the deposition. Layers fabricated with this newly implemented process demonstrate a clear phase transition typical for VO2.
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|
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Plasmonically active nanostructures for optical filtering
Idesová, Beáta ; Liška, Jiří (referee) ; Rovenská, Katarína (advisor)
This bachelor’s thesis deals with optical color filters composed of plasmonically active nanostructures and studies the parameters which influence the performance of such filters. Using electron beam litography and selective reactive ion etching, plasmonic hole-like filters were prepared in alumina film on fused silica substrate. The fabricated arrays of nanostructures, acting as optical filters, varied in shape and size of the nanostructures, distances among the nanostructures and their lateral arrangement within the arrays. The influence of these factors on transmission spectra of plasmonic filters was experimentally analysed using optical spectroscopy. A majority of the observed alternations of the measured transmission spectra was consistent with the research study which is, as well, part of this thesis. The highest color filtering selectivity was observed in arrays with divided square structure shape which also exhibited decent transmittance.
|
|
|
Preparation and characterization of SNOM probes
Robešová, Magdaléna ; Rovenská, Katarína (referee) ; Dvořák, Petr (advisor)
This Bachelor’s thesis is about the preparation of precision probes for Scanning Nearfield Optical Microscopy (SNOM) and its characteristics. Since SNOM probes influence the near electromagnetic field, the quality of their construction and their exact description is a key element for the valuable interpretation of measured data. The goal of this thesis is to grant literature research about SNOM, SNOM probes and their preparation process. Secondly, to produce and characterize the functional SNOM probes, which could then be used to detect optical interferences of Surface Plasmon Polaritons (SPPs).
|
|
|
Dielectric metasurfaces as modern optical components
Rovenská, Katarína ; Kolařík, Vladimír (referee) ; Ligmajer, Filip (advisor)
Vďaka ich vysokej verzatilite a nízkej priestorovej náročnosti sú metapovrchy sľubným nasledovníkom tradičných optických komponentov. Táto práca sa upriamuje na metapovrchy, ktoré môžu nahradiť polvlnné doštičky a difraktívne deliče zväzku. Práca prezentuje dve stratégie výroby nanoštruktúr z oxidu titaničitého s vysokým pomerom strán -- jedna používa reaktívne iónové leptanie vrstvy TiO2 skrz kovovú masku, kým druhá používa štrukturovaný elektrónový rezist ako formu pre depozíciu atomárnych vrstiev TiO2. V závere práce sú charakterizované a analyzované optické vlastnosti vyrobených štruktúr, predovšetkým ich fázový posun a transmisivita.
|
|
|
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.
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