Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 38: Photonics II
Q 38.4: Talk
Wednesday, March 16, 2022, 14:45–15:00, Q-H15
Probing intracavity fields of high Q-microresonators with free electrons — Jan-Wilke Henke1,2, Arslan Sajid Raja3, Armin Feist1,2, Guanhao Huang3, Germaine Arend1,2, Yujia Yang3, •F. Jasmin Kappert1,2, Rui Ning Wang3, Hugo Lourenco-Martins1,2, Jiahe Pan3, Junqiu Liu3, Ofer Kfir1,2,4, Tobias J. Kippenberg3, and Claus Ropers1,2 — 1Georg-August-Universität, Göttingen, Germany — 2Max Planck Institute of Multidisciplinary Sciences, Göttingen, Germany — 3Swiss Federal Institute of Technology Lausanne (EPFL), Lausanne, Switzerland — 4School of Electrical Engineering, Tel-Aviv University, Tel-Aviv, Israel
Ultrafast electron microscopes are a powerful platform for investigating confined optical modes in photon-induced near-field electron microscopy (PINEM). Mapping nanophotonic devices promises a unique access to evanescent optical fields and nonlinear phenomena.
In this work, we use free electrons to characterize the intracavity field of a high-Q Si3N4 microresonators, both spatially and spectrally [1]. Moreover, when altering the intracavity state, changes in the electron energy spectra signal the onset of four-wave mixing and the population of multiple optical modes in the resonator.
Future studies will explore the impact of multimode intracavity fields on the electron-light scattering, and might ultimately enable a nanoscale characterization of non-linear states like dissipative Kerr solitons by means of electron microscopy.
[1] J.-W. Henke, A. S. Raja et al., Nature, 600, 653-658, (2021)