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Interaction between SNOM tip and near-field
Krpenský, Jan ; Kvapil, Michal (referee) ; Dvořák, Petr (advisor)
Interaction between a probe for scanning near-field optical microscopy (SNOM) and near electromagnetic field is a fundamental problem, with its solution being a necessary condition for the correct interpretation of experimental data. This bachelor's thesis is aiming to thoroughly describe this problem and by precise manufacturing of our own SNOM probes help to reach solution of this problem. For this purpose, the detection of near-field generated by interference of surface plasmon polaritons (SPP) on square shape nanostructures is being used. This study has proven the dependence of SNOM probe sensitivity to near-field components on the size of a SNOM aperture.
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Luminescence of semiconductors studied by scanning near-field optical microscopy
Těšík, Jan ; Klapetek, Petr (referee) ; Křápek, Vlastimil (advisor)
This work is focused on the study of luminescence of atomic thin layers of transition metal chalkogenides (eg. MoS2). In the experimental part, the work deals with the preparation of atomic thin layers of semiconducting chalcogenides and the subsequent manufacturing of plasmonic interference structures around these layers. The illumination of the interference structure will create a standing plasmonic wave that will excite the photoluminescence of the semiconductor. Photoluminescence was studied both by far-field spectroscopy and near-field optical microscopy.
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Use of a special optical fiber in an electron microscope chamber
Černek, Ondrej ; Konečný, Martin (referee) ; Pavera, Michal (advisor)
This bachelor thesis is concerned about the modification of vacuum chamber of the Scanning Electron Microscope VEGA developed by TESCAN Brno s.r.o. in order to implementation of Scanning Probe Microscope. Moreover, it is dedicated to development of apparatus for using hollow optical fiber allowing the guidance of light and various gases on the sample surface placed in the vacuum of electron microscope. By using the hollow optical fiber as a probe of Scanning Probe Microscope, it is possible to work with a tip with specific properties. A brief introduction to Scanning Electron Microscopy and Atomic Force Microscopy is presented in the theoretical part. Furthermore, there is a technique of using optical fibers in Scanning Near-field Optical Microscopy described. Also a problem of vacuum systems, gas flow through the pipe and technique of Gas Injection System is introduced. In the construction part, there are initiated steps in the development of the vacuum chamber and the apparatus allowing the guidance of hollow optical fiber into the chamber of microscope. The experimental part presents the result of measurements obtained by probe of Scanning Probe Microscope with modified optical fiber and gas transmissivity of hollow optical fiber.
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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.
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Local characterization of electronic devices
Müller, Pavel ; Škarvada, Pavel (referee) ; Tománek, Pavel (advisor)
The development of micro and nanoelectronics and nanophotonics needs novel characterization techniques to ensure higher quality of designed devices. The thesis describes a use of Scanning Near-field Optical Microscopy (SNOM) in dimensional control and in local investigation of diverse physical parameters. As example of its potential, the correlation between object topography and reflection measurement of capacitors is shown.
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Methods of imaging and analysis of biological specimens
Novotná, Veronika ; Tománek, Pavel (referee) ; Knápek, Alexandr (advisor)
Bachelor thesis deals with characterization of human tissues and bacteria from the microscopic point of view. Physical principles of SNOM and electron microscopy (TEM, SEM, ESEM), together with their suitability for observing of biological specimens, were presented. In the next section, there is focus on data transformation from electron microscopy from time plane to image plane and their following processing. Next section is about experimental preparation of specimens for observing in SEM, ESEM and SNOM. Currently there is an idea to use scanning near-field optical microscope for biological research. That is why the goal of this thesis is compare SNOM and EM techniques, mentioned above. In this thesis we try to use SNOM as a cheaper option than EM in the observation of biological specimens. EM and SNOM allow obtaining different, however comparable and complementary information of the specimen.
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Automatization of experimental setup for optical spectroscopy
Čecháček, Jan ; Nováček, Zdeněk (referee) ; Dvořák, Petr (advisor)
This bachelor thesis deals with the modernization and improvement of an application that automates measurements on an experimental setup for spectral and topographic mapping using confocal microscopy and near-field microscopy. The arrangement of the report, the principle of communication of the program with individual parts of the report and the principle of data collection and processing are described here. The output of the program are point spectra and 2D maps describing the topography, intensity and position of the spectral peaks. The thesis includes a research study of optical and time-resolving optical spectroscopy and their applications in nanophotonics. The correct functionality of the program is demonstrated by the results of measurements of perovskite MAPbI3 and organic substrate.
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Multifunctional SNOM probes of new generation for correlative SEM/SPM measurements
Zezulka, Lukáš ; Kolíbal, Miroslav (referee) ; Spousta, Jiří (advisor)
Práce se věnuje návrhu multifunkční SNOM sondy pro korelativní SEM/SPM měření využívající dutého optického vlákna s plným jádrem. V rešerši jsou prozkoumány možné způsoby výroby SNOM hrotů na dutém optickém vlákně, využití dutých kapilár pro přívod pracovních tekutin ke vzorku a možnosti přívodu potenciálového rozdílu ke vzorku pomocí kapilár vyplněných vodivým materiálem. Dále je v práci prezentován vyvinutý způsob výroby unikátních SNOM hrotů a celý koncept je ověřen provedenými korelativními měřeními. Následně jsou diskutované problémy spojené s výrobou a měřeními.
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