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O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II: Ultrafast and Nonlinear Phenomena (joint session O/CPP)

O 18.1: Hauptvortrag

Montag, 16. März 2020, 15:00–15:30, WIL A317

Probing Nanophotonic Modes and Optical Phase Shaping of Electron Beams in Ultrafast Transmission Electron Microscopy — •Armin Feist — IV. Physical Institute, University of Goettingen, 37077 Göttingen, Germany

Ultrafast transmission electron microscopy (UTEM) combines the versatile imaging, diffraction and spectroscopy capabilities of state-of-the-art TEM with femtosecond temporal resolution achieved by a laser-pump/electron-probe scheme [1,2]. The novel applications of UTEM include the study of coherent inelastic electron-light scattering (IELS) at laser-excited nanostructures [3,4].

Here, I will briefly introduce the UTEM methodology and show recent results of the Göttingen UTEM instrument, which features high coherence electron pulses generated from nanoscale field emitter tips [2]. Besides nanometer mapping of chiral optical near-fields and local plasmonic modes, IELS enables the transverse and longitudinal phase control of the free-electron wavefunction [4,5], with applications for coherent electron beam splitters and generating attosecond electron pulse trains. Furthermore, the phase-matched interaction of electrons with optical whispering gallery modes (WGMs) enables a strongly enhanced coupling and traces the ring-down of a dielectric microresonator [6].

[1] A. H. Zewail, Science 328, 187 (2010). [2] A. Feist et al., Ultramicroscopy 176, 63 (2017). [3] Barwick et al., Nature 462, 902 (2009). [4] A. Feist et al., Nature 521, 200 (2015). [5] K. E. Priebe et al., Nat. Photonics 11, 793 (2017). [6]. O. Kfir et al., arXiv:1910.09540 (2019).