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Design and fabrication of interference filters for optical fibers
Švábík, Marek ; Liška, Jiří (referee) ; Konečný, Martin (advisor)
This bachelor's thesis is focused on the design and fabrication of interference filters that can be mounted on the ends of optical fibers. The thesis discusses the production process from the filter design to its fabrication by depositing thin layers on a Si wafer. Subsequently, it describes a design that allows the filter to be mounted on the end of an optical fiber and the manufacturing method of such a mountable cap. The fabrication itself involved etching the wafer. After mounting, the functionality of the manufactured filter was tested by measuring its transmittance.
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Robotic Manipulator Exploiting RC Components and Servos
Liška, Jakub ; Nosko, Svetozár (referee) ; Zemčík, Pavel (advisor)
Cieľom tejto diplomovej práce bolo vytvorenie vlatného robotického manipulátoru, s pou-\\žitím RC(diaľkovo ovládaných) komponentov a servomotorov. V rámci riešenia bolo potre-\\bné robotický manipulátor vybaviť senzorikou, ktorá umožnuje detekciu kolízii s okolím a zabezpečuje tak bezpečnosť obsluhy v pracovnom priestore manipulátoru. Robotický manipilátor je taktiež vybavený absolútnimi enkódermi pre snímanie polohy jednotlivých kĺbov, akcelerometrom a senzormi pre meranie záťaží pôsobiacich na jednotlivé kĺby. O pohyb ramena sa starajú štandardné krokové motory. Samotné telo robotického manipulátoru bolo navrhnuté s ohľadom na jednotlivé komponenty a je možné ho vyrobiť pomocou 3D tlače. Súčastou riešenia je aj užívateľské rozhranie, pomocou ktorého je možné robotické rameno ovládať.
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Wireless Control of Presentations by Pocket Computer
Liška, Jan ; Smrčka, Aleš (referee) ; Novosad, Petr (advisor)
This work deals with design and realization of an application for Pocket PC which controls presentation on notebook or desktop PC. The goal of this project is to free person from staying behind the computer during presentation. With this remote controller this person can move freely in the whole room and can be in better contact with audience. This document consists of short introduction to Pocket PCs and development tools for this devices. The main part describes concept and implementation of this application by client-server architecture. In the end there are suggestions for future development of this application.
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Reconstruction of the cable suspended footbridge in Kroměříž
Liška, Jaroslav ; Kulhavý,, Tomáš (referee) ; Klusáček, Ladislav (advisor)
The Diploma thesis deals with the reconstruction design of a footbridge in the city of Kroměříž, Czech Republic. The footbridge would serve as safe transport for pedestrians over the Morava river. The main objective of the thesis is to conceive two or three reconstruction designs. The most suitable one will be opted for and elaborated in more detail. Eventually, strengthening of the bridge by means of additional prestressing using mono-strand post-tensioning systems is picked as the best solution of the planned reconstruction. The monostrand post-tensioning system is led under the deck, the cross section being outside. External cables are anchored in concrete blocks built around existing supports. Load-generated internal forces are calculated on a spatial bar model with non-linear first-order analysis. The calculation is executed using the finite element method in the midas Civil programme. The chosen reconstruction design is then assessed against load capacity limit states, and functionality. Also, the designed reconstruction is assed for dynamic effects. Results are compared with existing structure, and verified against the real-time tensometric measurement-obtained data. Dimensions, assessment of load-bearing structure, and structural details are all made according to valid Eurocodes.
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Call Center Process Automation Plan in ISO 9001:2000 Certified Organization
Hovadík, Jiří ; Liška, Jiří (referee) ; Dydowicz, Petr (advisor)
This master’s thesis deals with system of evidence customer requests in service organization. The introduction describes services activities in domain are focused on payment terminals and contemporary situation in call center. The suitable selection implementation tools are done. The second part contains the design of system for requests evidence and design of imports for service information system. The evaluation of the master’s thesis and some future improvements are presented.
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Transport properties of one dimensional magnetic nanostructures
Holobrádek, Jakub ; Liška, Jiří (referee) ; Vaňatka, Marek (advisor)
Magnetic nanowires have been recently under the scope for their specic properties and applications in microelectronics and sensors. This work deals with measurement of transport properties of nanowires in magnetic field. Nanowires prepared in the range of the thesis were grown by the physical vapor deposition method in colaboration with the University of Technology Sydney. The main task of the thesis was to develop a process of contacting single nanowires by electron beam lithography and measuring them using anisotropic magnetoresistance in angle dependent magnetic field. Characterization techniques such as transmission electron microscopy, energy-dispersive X-ray spectroscopy and magnetic force microscopy were used to provide further analysis.
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Real Time Melfa Controlling Using ROS
Liška, Jakub ; Janoušek, Vladimír (referee) ; Rozman, Jaroslav (advisor)
The goal of this bachelor thesis is to explore the possibilities of controlling the industrial robotic arm Mitsubishi Melfa RV-6SL using ROS (Robot Operating System) and the subsequent implementation of this knowledge into a functional application. This work describes to the reader not only the theoretical foundations of the work, but also how to create the configuration packages needed to simulate the robotic arm in the simulation environment Gazebo, as well as real-time control of the real robotic arm. The text also describes path planning using the MoveIt library, based on poses of robotic arm selected in the Rviz visualization environment.
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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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Fabrication and characterisation of plasmonic antennas on selected thin film with aim to get enhanced absorption due to presence of strong coupling
Vodička, Martin ; Kepič, Peter (referee) ; Liška, Jiří (advisor)
Strong coupling systems offer many important applications in various fields such as photonics, chemistry, nonlinear optics and others. This Bachelor's thesis focuses on the fabrication of metal plasmonic structures suitable for the formation of strong coupling between localized surface plasmon antennas and hexagonal boron nitride (hBN) thin film phonons in the infrared region. In the case of inducing a strong coupling, an increase in absorption should occur, which makes it possible to use this system to fabricate an infrared detector, the so-called microbolometer. The thesis summarizes important findings from electromagnetic field theory, describes the formation of strong coupling from the perspective of classical physics and gives examples of systems with strong coupling. Furthermore, the formation of surface plasmon polaritons and localized surface plasmons (LSPs) is theoretically described. Plasmonic antennas, their fabrication, applications and physical properties of hBN are described. In the practical part of the thesis, fabrication of plasmonic antennas under or on hBN thin film has been realized. The fabricated samples were characterized by scanning electron microscopy and the spectral response was measured by Fourier transform infrared spectroscopy. In the spectra, the absorption of hBN at 7.3 m was confirmed and additional transmittance minima corresponding to the presence of antennas were detected. The presence of a strong coupling between the LSPs antennas and the phonons of the native SiO2 layer was probably observed. Whether there was a strong coupling between the LSPs antennas and the hBN phonons cannot be inferred from the the obtained results.
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Fabrication and testing of microbolometer or other infrared detector based on plasmonic antennas
Děcký, Marek ; Gallina, Pavel (referee) ; Liška, Jiří (advisor)
This bachelor’s thesis is focused on study and fabrication of infrared detectors. Other than just providing a literature research and plasmonics research into the topic, the main goal of this thesis is to propose new designs, manufacturing and characterization such detectors. Specifically the uncooled microbolometer that uses plasmonic antennas for the amplification of the strong coupling which forms between the localized surface plasmons of golden antennas and a phonons of thin dielectric film made from silicon dioxide. The preparation of several types of microbolometers on silicon substrates was conducted using electron beam lithography, photolithography and by thin film deposition techniques. The individual microbolometers differed mainly in the width of the layers between the temperature sensitive meanders and the antennas, but also in the dimensions of the antennas. In the first two sets of microbolometers, the meanders were made from titanium, however meanders in the last set of microbolometers were fabricated from platinum. Reaction of the microbolometers on visible and infrared radiation was tested using measurement of electrical resistance. It was discovered that fabricated microbolometers with titanium meanders significantly reacted on visible light by lowering their resistance. This means they behave like semiconductor. Microbolometers also reacted on infrared radiation by lowering their resistance, but only when temperature of black body source exceeded 400 °C. Reaction on visible and infrared radiation was not observed on microbolometers with platinum meanders with one exception.
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