Beam shaping and adaptive optics with electrons
CIC nanoGUNE Seminars
- Speaker
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Johan Verbeeck, EMAT, University of Antwerp, Belgium
- When
-
2019/03/18
12:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
iCal
Recent years have seen a rise in the control over the quantum state of
accelerated electron wave packets as found in e.g. transmission electron
microscopes. Wave optics for photons and electrons have many things in common
and demonstration of a rich state of nondiffracting or otherwise peculiar wave
states have been demonstrated. An ideal example is the vortex wave state in
which the electron can be brought into an eigenstate of the angular momentum
operator along its propagating direction. Such an electron vortex state
resembles the wave function of orbitals in atoms and can be of similar or even
smaller size. Having such control over the electron wavefunction in
experiments, opens interesting new avenues for quantum experiments, further
increasing the capabilities of electron microscopy. In this talk I will give
an overview of these developments. The development of the counterpart of an
optical spatial light modulator will be discussed, allowing full control over
the phase of individual electron wave packets in a computer controllable
manner. Such a device is expected to further boost interest in wave
manipulation with electrons and will provide the basis for automated and
adaptive experiments in electron microscopy, following in the step of the
recent breakthroughs that were made in optics.
**Host** : A. Chuvilin