Browsing Ústav fyzikálního inženýrství by Author "Horák, Michal"
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Comparative study of plasmonic antennas fabricated by electron beam and focused ion beam lithography
Horák, Michal; Bukvišová, Kristýna; Švarc, Vojtěch; Jaskowiec, Jiří; Křápek, Vlastimil; Šikola, Tomáš (Springer Nature, 2018-06-25)We present a comparative study of plasmonic antennas fabricated by electron beam lithography and direct focused ion beam milling. We have investigated optical and structural properties and chemical composition of gold ... -
Imaging of Electric and Magnetic Near Field
Horák, Michal; Křápek, Vlastimil; Šikola, Tomáš (Wiley, 2020-07-10)Localized surface plasmon resonances are self-sustained collective oscillations of free electrons in metallic nanostructures. We have demonstrated the possibility to map their electric and magnetic near field by electron ... -
Independent engineering of individual plasmon modes in plasmonic dimers with conductive and capacitive coupling
Křápek, Vlastimil; Konečná, Andrea; Horák, Michal; Ligmajer, Filip; Stöger-Pollach, Michael; Hrtoň, Martin; Babocký, Jiří; Šikola, Tomáš (WALTER DE GRUYTER GMBH, 2020-03-01)We revisit plasmon modes in nanoparticle dimers with conductive or insulating junction resulting in conductive or capacitive coupling. In our study, which combines electron energy loss spectroscopy, optical spectroscopy, ... -
Influence of experimental conditions on localized surface plasmon resonances measurement by electron energy loss spectroscopy
Horák, Michal; Šikola, Tomáš (Elsevier, 2020-09-01)Scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy (EELS) has become a standard technique to map localized surface plasmon resonances with a nanometer spatial and a sufficient ... -
Influence of primary beam energy on localized surface plasmon resonances mapping by STEM-EELS
Horák, Michal; Šikola, Tomáš (Cambridge University Press, 2021-07-30)We have discussed the impact on experimental characteristics which are important to detect localized surface plasmon peaks in EELS successfully, namely: the intensity of plasmonic signal, the signal to background ratio, ... -
Limits of Babinet’s principle for solid and hollow plasmonic antennas
Horák, Michal; Křápek, Vlastimil; Hrtoň, Martin; Konečná, Andrea; Ligmajer, Filip; Stöger-Pollach, Michael; Šamořil, Tomáš; Paták, Aleš; Édes, Zoltán; Metelka, Ondřej; Babocký, Jiří; Šikola, Tomáš (Springer Nature, 2019-12-01)We present an experimental and theoretical study of Babinet’s principle of complementarity in plasmonics.We have used spatially-resolved electron energy loss spectroscopy and cathodoluminescence to investigate electromagnetic ... -
Magnetic Near Field Imaging with Electron Energy Loss Spectroscopy Based on Babinet's Principle
Horák, Michal; Křápek, Vlastimil; Hrtoň, Martin; Konečná, Andrea; Ligmajer, Filip; Stöger-Pollach, Michael; Šikola, Tomáš (Cambridge University Press, 2020-07-30)We present a study of Babinet’s principle of complementarity in plasmonics focused on measuring the magnetic near field by EELS. We have studied bow-tie and diabolo antennas and elementary disc-shaped plasmonic antennas. -
Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet's Principle
Hrtoň, Martin; Konečná, Andrea; Horák, Michal; Šikola, Tomáš; Křápek, Vlastimil (American Physical Society, 2020-05-19)We theoretically study plasmonic antennas featuring areas of extremely concentrated electric or magnetic field, known as hot spots. We combine two types of electric-magnetic complementarity to increase the degree of freedom ... -
Plasmonic Properties of Silver Amalgam Nanoparticles Studied by Analytical Transmission Electron Microscopy
Horák, Michal; Ligmajer, Filip; Šikola, Tomáš; Fojta, Miroslav; Daňhel, Aleš (Cambridge University Press, 2020-07-30)We present a study of optical properties of silver amalgam and demonstrate the plasmonic nature of its nanoparticles as they support localized surface plasmon resonances (LSPR), which are self-sustained collective oscillations ... -
Structural and optical properties of monocrystalline and polycrystalline gold plasmonic nanorods
Kejík, Lukáš; Horák, Michal; Šikola, Tomáš; Křápek, Vlastimil (The Optical Society, 2020-11-03)The quality of lithographically prepared structures is intimately related to the properties of the metal film from which they are fabricated. Here we compare two kinds of thin gold films on a silicon nitride membrane: a ...