Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Plasmonics III (joint session O/CPP)
CPP 35.5: Vortrag
Mittwoch, 3. April 2019, 11:30–11:45, H8
Advances with Attosecond Electron Pulse Trains in Ultrafast Transmission Electron Microscopy — •Thomas Rittmann1, Katharina E. Priebe1, Christopher Rathje1,2, Sascha Schäfer1,2, Sergey V. Yalunin1, Thorsten Hohage3, Armin Feist1, and Claus Ropers1 — 14th Physical Institute - Solids and Nanostructures, University of Göttingen, Germany — 2Institut für Physik, University of Oldenburg, Germany — 3Institut für Numerische und Angewandte Mathematik, University of Göttingen
In an ultrafast transmission electron microscope (UTEM), inelastic scattering between a free-electron beam and strong optical near fields [1] allows for a coherent manipulation of the electron quantum state. In this mechanism, the optical field imprints a sinusoidal phase modulation on the electron wave function, which, after subsequent dispersive propagation, results in a temporal electron density modulation [2].
Here, we employ a second electron-light interaction at varied propagation distances with accurately controlled phase delay, and reconstruct the temporal shape of the electron density at each distance with our quantum state tomography algorithm SQUIRRELS [3]. We demonstrate the compression of electron pulses into trains of attosecond bursts and explore the improvement of pulse durations by minimizing phase averaging effects. Such pulse trains will promote new forms of ultrafast electron microscopy with attosecond resolution.
[1] B. Barwick et al., Nature 462, 902-906 (2009)
[2] A. Feist et al., Nature Physics 12, 1000-1004 (2016)
[3] K. Priebe et al., Nature Photonics 11, 793-797 (2017)