Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Optical dichroism in vortex electron energy-loss spectroscopy
Ošmera, Martin ; Dub, Petr (oponent) ; Konečná, Andrea (vedoucí práce)
Vortex electron beams (VEBs) carry orbital angular momentum and when they interact with a chiral specimen, dichroism can be observed. In electron energy loss spectroscopy, left-handed VEBs yield different spectra than right-handed VEBs. This could be utilized in the analysis of chiral molecules or nanostructures. We present a semianalytical fully-retarded model for the interaction of a non-focused VEB with a point-like particle, and a numerical quasistatic model for the interaction of a non-focused VEB with a \enquote{macroscopic} chiral nanostructure.
Optical dichroism in vortex electron energy-loss spectroscopy
Ošmera, Martin ; Dub, Petr (oponent) ; Konečná, Andrea (vedoucí práce)
Vortex electron beams (VEBs) carry orbital angular momentum and when they interact with a chiral specimen, dichroism can be observed. In electron energy loss spectroscopy, left-handed VEBs yield different spectra than right-handed VEBs. This could be utilized in the analysis of chiral molecules or nanostructures. We present a semianalytical fully-retarded model for the interaction of a non-focused VEB with a point-like particle, and a numerical quasistatic model for the interaction of a non-focused VEB with a \enquote{macroscopic} chiral nanostructure.

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