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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantum Effects (Cavity QED)
Q 60.3: Vortrag
Freitag, 13. März 2020, 11:30–11:45, f442
The coupling of free-electrons with whispering-gallery modes — •Ofer Kfir1, Hugo Lourenço-Martins1, Gero Storeck1, Murat Sivis1, Tyler Harvey1, Tobias Kippenberg2, Armin Feist1, and Claus Ropers1 — 1University of Göttingen, Göttingen, Germany — 2EPFL, Lausanne, Switzerland
Electron microscopes are a ubiquitous tool for nanoscopic characterization, providing for resolutions down to the atomic scale. In recent years, classical light fields are being employed for quantum-state manipulations of electron beams, enabling acceleration (1), attosecond electron pulses (2) and light-induced phase retarders (3). However, the typically weak coupling between electrons and photons requires strong fields to produce meaningful effects. Here we show theoretically and experimentally that whispering-gallery modes (WGM) in microresonators can push electron-photon interactions towards the strong coupling regime. Our experiment (4) shows that WGMs have an enhanced interaction with electrons, manifested in hundreds of electron-energy sidebands. We discuss a roadmap to approach a measureable entanglement between cavity-photons and free-electrons (5), and predict the properties of such a state. In the future, complex optical states may be imprinted on electron beams, providing for optical spectroscopy with spatial resolution at the atomic scale.
1. E. A. Peralta, et al., Nature. 503, 91 (2013). 2. K. E. Priebe, et al., Nat. Phot. 11, 793 (2017). 3. O. Schwartz, et al., Nat. Meth. 16, 1016 (2019). 4. O. Kfir, et al., arXiv:1910.09540 (2019). 5. O. Kfir, Phys. Rev. Lett. 123, 103602 (2019),