Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 2: Ultrafast phenomena

HL 2.2: Vortrag

Montag, 11. März 2013, 09:45–10:00, H2

Femtosecond point-projection imaging of nanostructures with coherent low-energy electron pulses — •Melanie Müller, Alexander Paarmann, and Ralph Ernstorfer — Fritz-Haber-Institut der MPG, Berlin, Germany

We report on the development of a novel approach for time-resolved imaging of nanostructures based on a metal nanotip used as laser-triggered low-energy electron point source (LEEPS) delivering highly coherent ultrashort electron pulses. Due to their high sensitivity to weak fields, low-energy electron pulses are particularly well-suited for mapping transient electric fields and charge distributions in photoexcited nanostructures. We present first experimental data on LEEPS projection imaging of semiconductor nanowires with femtosecond electron pulses, demonstrating spatial resolution of several 10 nm. For the upcoming implementation of pump-probe measurements we expect 100 femtosecond temporal resolution, supported by numerical simulations of the electron pulse propagation.