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Preparation and characterization of optical metasurfaces
Weiss, Vlastimil ; Čižmár, Tomáš (referee) ; Dvořák, Petr (advisor)
This thesis presents a comprehensive study on the preparation and characterization of dielectric optical metasurfaces. Optical metasurfaces, which are artificially structured surfaces, enable precise manipulation of electromagnetic waves at a subwavelength scale, surpassing conventional optics in terms of spatial resolution and the complexity of optical transformations. The work is conducted at the Institute of Physical Engineering, Brno University of Technology in colaboration with CEITEC, and involves the use of advanced techniques such as ion beam etching through masks created via electron beam lithography (EBL) and the deposition of optically active materials into EBL matrices. The primary objectives include a thorough literature review, the fabrication of dielectric metasurfaces based on phase control mechanisms, and the detailed morphological and optical characterization of the produced structures. The research employs digital holographic microscopy and confocal optical spectroscopy for optical characterization, as well as numerical and semi-analytical simulations. The results contribute to the ongoing development of high-efficiency optical components and highlight the potential applications of biophotonic devices in the field of nano-optics.
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Measurement of the local phase of metasurfaces using digital holographic microscopy
Weiss, Vlastimil ; Bouchal, Petr (referee) ; Dvořák, Petr (advisor)
This bachelor's thesis consists of research studies of optical metasurfaces that are capable of modifying and governing incident radiation via the shift of a local phase. It also discusses experimental microscopic techniques with the ability to measure the distribution of the said phase. Experimental results of the phase distribution of the electromagnetic wave impinging on metal metasurface presented in this thesis are captured through quantitative in-line and off-axis digital holographic microscopy. These metasurfaces utilize both geometrical phase and localised surface plasmon resonance (LSPR). Measured results are in accordance with previous scientific studies. Finally, the successful outcome in the form of measurement of the geometrical phase introduced by the single building block is presented as well as the application of an analytical model for characterization of phase response generated by interaction with optical metasurfaces.
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Measurement of the local phase of metasurfaces using digital holographic microscopy
Weiss, Vlastimil ; Bouchal, Petr (referee) ; Dvořák, Petr (advisor)
This bachelor's thesis consists of research studies of optical metasurfaces that are capable of modifying and governing incident radiation via the shift of a local phase. It also discusses experimental microscopic techniques with the ability to measure the distribution of the said phase. Experimental results of the phase distribution of the electromagnetic wave impinging on metal metasurface presented in this thesis are captured through quantitative in-line and off-axis digital holographic microscopy. These metasurfaces utilize both geometrical phase and localised surface plasmon resonance (LSPR). Measured results are in accordance with previous scientific studies. Finally, the successful outcome in the form of measurement of the geometrical phase introduced by the single building block is presented as well as the application of an analytical model for characterization of phase response generated by interaction with optical metasurfaces.
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