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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Electron microscopy and spectroscopy of nanophotonic structures and materials
 Řepa, Rostislav ; Paták, Aleš (referee) ; Křápek, Vlastimil (advisor)
Bleskosvodný jev je dobře známý princip elektrostatiky, který vyjadřuje vznik silného elektrického pole v blízkosti zakřivených částí nabitého vodiče. V oblasti plazmoniky je podobně pozorován vliv lokálního zakřivení na indukované elektrické pole v okolí kovových nanočástic (plazmonických antén). Kromě tohoto tzv. plazmonického bleskosvodného jevu přispívají k zesílení pole i další jevy, jako je rezervoár náboje plazmonické antény, lokalizace povrchové plazmonové vlny, nebo interakce mezi dvěma plazmonickými anténami. Tato práce využívá spektroskopii energiových ztrát elektronů a elektromagnetických simulací ke kvantitativnímu zkoumání těchto odlišných jevů tím, že izoluje jejich dílčí příspěvky k velikosti indukovaného elektrického pole v okolí plazmonické antény.
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Plasmonic lightning-rod effect
 Řepa, Rostislav ; Konečná, Andrea (referee) ; Křápek, Vlastimil (advisor)
This bachelor thesis deals with an experimental and theoretical research of the plasmonic lightning-rod effect. Electron energy loss spectroscopy has been used to investigate the electromagnetic response of plasmonic antennas and to study the impact of the curvature of their surfaces on the local enhancement of an electromagnetic field. A theoretical background based on interactions of the electromagnetic field and free electrons in metals is provided in the first chapter. Next, experimental and theoretical methods including the fabrication process of plasmonic antennas and inicialization of simulations are introduced. Observed resonances of localised surface plasmons are characterised in the spectral region and their mapping is performed. The calculated loss spectra are compared with the experimental loss spectra and the field enhancemnet due to the curvature of plasmonic antennas is evaluated.
Detailed record
Plasmonic lightning-rod effect
 Řepa, Rostislav ; Konečná, Andrea (referee) ; Křápek, Vlastimil (advisor)
This bachelor thesis deals with an experimental and theoretical research of the plasmonic lightning-rod effect. Electron energy loss spectroscopy has been used to investigate the electromagnetic response of plasmonic antennas and to study the impact of the curvature of their surfaces on the local enhancement of an electromagnetic field. A theoretical background based on interactions of the electromagnetic field and free electrons in metals is provided in the first chapter. Next, experimental and theoretical methods including the fabrication process of plasmonic antennas and inicialization of simulations are introduced. Observed resonances of localised surface plasmons are characterised in the spectral region and their mapping is performed. The calculated loss spectra are compared with the experimental loss spectra and the field enhancemnet due to the curvature of plasmonic antennas is evaluated.
Detailed record

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