"Beam shaping and adaptive optics with electrons"

Who: Johan Verbeeck, EMAT, University of Antwerp, Belgium

Place: nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian

Date: Monday, 18 March 2019, 11:00

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

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