Mainz 2017 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 53: Poster: Quantum Optics and Photonics III

Q 53.72: Poster

Donnerstag, 9. März 2017, 17:00–19:00, P OG2

Coherent control of free-electron beams on attosecond time scales — •Christopher Rathje, Katharina E. Priebe, Armin Feist, Sascha Schäfer, and Claus Ropers — lV. Physical Institute - Solids and Nanostructures, University of Göttingen, Germany

Ultrafast transmission electron microscopy (UTEM) is a recently developed approach to investigate dynamics with both nanometer spatial and femtosecond temporal resolution. Here, we use the highly coherent free-electron beam of our UTEM [1] to study inelastic electron-light scattering [2]. In particular, we manipulate the quantum state of single electrons using intense tailored light fields [3,4]. The optical near-field imprints a sinusoidal phase modulation on the electron wavefunction, which is manifest in a comb of sidebands in the electron kinetic energy distribution [3]. In a recent experiment [4], we demonstrated the quantum coherence and reversibility of this process by employing two spatially separated near-fields, such that the final quantum state sensitively depends on the relative near-field phase. Here, we describe our progress towards measuring the predicted self-compression of the initial wavefunction into a train of attosecond bursts [3]. The quantum coherent electron-light interaction is a promising approach for temporal structuring of free-electron beams with attosecond precision. [1] Feist et al., arXiv:1611.05022 (2016) [2] Barwick et al., Nature 462, 902 (2009) [3] Feist et al., Nature 521, 200-203 (2015) [4] Echternkamp et al., Nat. Phys. 12, 1000-1004 (2016)