SKM 2021 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: Instrumentation and Methods
KFM 9.3: Talk
Wednesday, September 29, 2021, 12:30–12:45, H1
High-Q microresonators facilitate efficient electron-photon interaction — Jan-Wilke Henke1,2, Arslan Sajid Raja3, Armin Feist1,2, Guanhao Huang3, •Germaine Arend1,2, Yujia Yang3, F. Jasmin Kappert1,2, Rui Ning Wang3, Marcel Möller1, Jiahe Pan3, Junqiu Liu3, Ofer Kfir1,2,4, Claus Ropers1,2, and Tobias J. Kippenberg3 — 1Georg-August Universität, Göttingen, Germany — 2Max Planck Institute for Biophysical Chemistry, Göttingen, Germany — 3Swiss Federal Institute of Technology, Lausanne, Switzerland — 4School of Electrical Engineering, Tel-Aviv University, Tel Aviv, Israel
High-Q Si3N4 microresonators are not only an ideal platform for studying nonlinear effects, such as Kerr solitons. Their flexible dispersion engineering capability also makes them an ideal candidate for phase-matched interactions between free electrons and confined light. This allows for nanoscale optical mode mapping and possibilities in free-electron quantum optics.
In this work, we demonstrate how velocity phase-matching can be used for highly efficient free-electron-photon coupling inside a transmission electron microscope [1]. The evanescent tail of optical near fields excited in an air-cladded Si3N4 microcavity via a continuous-wave laser beam interacts with passing electrons. We observe multiple orders of electron-photon scattering resulting in a strong broadening of the electron energy spectrum. This coupling enables various further studies such as electron-triggered single photon sources.
[1] J.-W. Henke, A. S. Raja, et al., preprint, arXiv:2105.03729 (2021)