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National Repository of Grey Literature 12 records found  previous11 - 12  jump to record: Search took 0.01 seconds. 
Imaging the magnetic field of plasmonic antennas based on Babinet's principle
 Špičáková, Tereza ; Horák, Michal (referee) ; Křápek, Vlastimil (advisor)
This thesis concerns plasmonic antennas and the electromagnetic field of surface plasmon polaritons. In the first chapter we look at the theory of the electromagnetic field and the electromagnetic wave associated with the interface between metals and dielectric materials and we explain Babinet’s principle. In the next part of the thesis we describe the process of fabrication of plasmonic antennas using Kaufman ion source and focused ion beam. We continue wuth the theoretical description of the electron energy loss spectroscopy and the application of this method for characterizing the optical response of these structures. In the last part we introduce the principles of processing the measured data and the conclusions drawen frome this data. Next we will analyze the limits of the validity of Babinet’s principle and using this principle, we will image the magnetic field of the antennas. Finally, we discuss the possibilities of describing this problem with computer simulation.
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Interaction of metallic nanoparticles and fast electrons
 Konečná, Andrea ; Tyc, Tomáš (referee) ; Dub, Petr (advisor)
Scanning transmission electron microscopy is one of the essential techniques suitable not only for imaging of nanostructures, but also for various kinds of spectroscopy and, as it was recently demonstrated, nanomanipulation. In this thesis, we deal with an interaction of fast electrons and metallic spherical nanoparticles, specifically aluminium and gold nanospheres. First, we present both analytical and numerical calculations of electron energy loss spectra and their analysis for different parameters. The main part of the thesis is devoted to theoretical calculations of forces acting on the nanosphere due to the electron passing in its close proximity. Based on our novel results revealing a time evolution of the mechanical force, we also propose a possible mechanism responsible for the nanoparticle movement in electron microscopes.
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