Prof. Dr. Nahid Talebi
Department of Physics, University of Kiel
gives a talk on the subject:
Phase-Locked Photon-Electron Interactions in Electron Microscopes
Electron microscopes are not only powerful imaging tools, but they also enable scientists to study quantum phenomena at the nanoscale. The flourishing field of ultrafast electron microscopy in recent years allows for exploring the quantum aspects of electron-photon interactions with electron microscopes and enables the investigation of the dynamics at the nanoscale spatial and femtosecond time resolution. Here, I outline our recent results where we have used cathodoluminescence spectroscopy to investigate the formation and propagation of exciton polaritons in van der Waals materials [1, 2]. Moreover, I will demonstrate and discuss a novel type of ultrafast electron microscopy that utilizes electron-driven photon sources [3] as internal radiation sources to map the dynamics of exciton polaritons and acquire their spectral phases [4]. Finally, our numerical investigations of the evolution of the electron wavepackets interacting with free-space and near-field light are demonstrated and will be highlighted as a roadmap for realizing the next generation of ultrafast electron microscopes flavoring the interaction of shaped electron wavepackets with light and matter [5].
References
[1] M. Taleb, F. Davoodi, F. Diekmann, K. Rossnagel, N. Talebi, Adv. Photonics Res. 3, 210012 (2022).
[2] F. Davoodi, M. Taleb, F. K. Diekmann, T. Coenen, K. Rossnagel, N. Talebi, ACS Photonics 9 (7), 2473–2482 (2022).
[3] N. Talebi, S. Meuret, S. Guo, M. Hentschel, A. Polman, H. Giessen, P. A van Aken, Nat. Commun. 10 (1), 599 (2019).
[4] M. Taleb, M. Hentschel, K. Rossnagel, H. Giessen, N. Talebi, Nat. Phys. (2023); doi.org/10.1038/s41567-023-01954-3
[5] N. Talebi, Phys. Rev. Lett. 125, 080401 (2019).
Interested parties are cordially invited.
Prof. Dr. Klinke