Heidelberg 2015 – wissenschaftliches Programm

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SYTL: Symposium Interactions between Twisted Light and Particles

SYTL 2: Symposium on interactions between twisted light and particles II (SYTL)

SYTL 2.2: Hauptvortrag

Freitag, 27. März 2015, 15:00–15:30, C/gHS

Inelastic effects on the lateral wave function of electron beams — •Javier García de Abajo — ICFO-The Institute of Photonic Sciences, Mediterranean Technology Park, Av. Carl Friedrich Gauss 3, 08860 Castelldefels (Barcelona), Spain

Electron beams carry spatial information encoded in their lateral wave function, which evolves as the beam interacts with different parts of a microscope, as well as with a sample. In this talk, we will formulate a rigorous theoretical analysis for the evolution of an electron beam due to inelastic interaction with some of those elements. In particular, we will study the transfer of orbital angular momentum between vortex electron beams and chiral samples, such as staircase plasmonic nanostructures and biomolecules, which are predicted to produce large dichroism in the momentum-resolved electron energy-loss spectra. Additionally, we will discuss the effect of thermal noise during the electron interaction with distant materials, for example when the electron is moving along the center of a hollow metallic tube, or when it is divided by a biprism, passed above a surface, and later recorded in the far field. Recently observed stochastic thermal deflections and lost of visibility in the interference fringes are shown to be explained by this formalism in semi-analytical form.