Berlin 2018 – wissenschaftliches Programm

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PRV: Preisträgervorträge

PRV III

PRV III: Preisträgervortrag

Mittwoch, 14. März 2018, 13:15–13:45, H 0105

Ultrafast transmission electron microscopy — •Sascha Schäfer — Carl von Ossietzky Universität Oldenburg, Germany --- Laureate of the Walter-Schottky-Prize

Ultrafast transmission electron microscopy (UTEM) provides a unique experimental tool to study ultrafast dynamics at the nanoscale, combining the temporal resolution of a pump-probe approach with the spatial resolution of electron microscopy. In UTEM, femtosecond electron pulses stroboscopically probe the transient state of excited solid-state nanostructures. Depending on the electron imaging geometry, local ultrafast dynamics in structural, electronic and spin degrees of freedom are accessible, so that UTEM may potentially yield a comprehensive understanding of ultrafast nanoscale dynamics in complex systems.

In this talk, I will give an overview on our recent progress in the Göttingen UTEM project, covering instrumental aspects, such as the development of coherent photo-driven electron sources [1], as well as emerging applications. Examples will include the imaging of ultrafast structural [2] and magnetic dynamics [3,4], the coherent optical control of free-electron states in confined light fields [5-7] and the generation of attosecond electron pulse trains [7].

[1] A. Feist et al., Ultramicroscopy 176, 63-73 (2017). [2] A. Feist, Struct. Dyn., accepted (2017); arXiv:1709.02805. [3] T. Eggebrecht, Phys. Rev. Lett. 118, 097203 (2017). [4] N. Rubiano da Silva, submitted, arXiv:1710.03307. [5] A. Feist et al., Nature 521, 200-203 (2015). [6] K. E. Echternkamp et al. Nature Phys. 12, 1000-1004 (2016). [7] K. E. Priebe et al., Nature Photonics 11, 793-797 (2017).