Speaker
Description
Introducing concepts from quantum optics into electron microscopy promises novel avenues for nanoscale probing and excitation of solid-state and photonic systems [1]. However, this requires the capability to induce and detect correlated multi-electron/photon states. In particular, strong coupling and precise control schemes remain challenging.
My talk will discuss recent progress in the efficient coupling of free electrons and photons via inelastic scattering at integrated photonic modes. Spontaneous scattering produces electron-photon pair and heralded photon number states, establishing an electron-driven source of quantum light [2].
Furthermore, we employ femtosecond-pulsed photoemission to generate Coulomb-correlated multi-electron states, and show how their coherent interaction with intense light induces femtosecond-to-attosecond phase-space correlations [3].
Finally, I will provide an outlook on new developments in coincidence spectroscopy, low-electron-energy coupling, and spectroscopy of solid-state systems, highlighting future opportunities in event-based and electron-number-resolved electron microscopy.
[1] García De Abajo, F. J. et al. Roadmap for Quantum Nanophotonics with Free Electrons. ACS Photonics 12, 4760–4817 (2025).
[2] Haindl, R., Di Giulio, V., Feist, A. & Ropers, C. Femtosecond and Attosecond Phase-Space Correlations in Few-Particle Photoelectron Pulses. Phys. Rev. Lett. 135, 165002 (2025).
[3] Arend, G. et al. Electrons herald non-classical light. Nat. Phys. 21, 1855–1862 (2025).