Quantum effects in the interaction of low-energy electrons with optical fields

Adamantios Synanidis; P. André D. Gonçalves; Claus Ropers; F. Javier García de Abajo

doi:10.1117/12.3027933

4 October 2024 Quantum effects in the interaction of low-energy electrons with optical fields

Adamantios Synanidis, P. André D. Gonçalves, Claus Ropers, F. Javier García de Abajo

Proceedings Volume 13117, Enhanced Spectroscopies and Nanoimaging 2024; 131170T (2024) https://doi.org/10.1117/12.3027933
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

The interaction between electron beams and nanoscale optical fields offers unique ways of studying ultrafast processes in matter with an unpreceded spatiotemporal and spectral resolution, currently approaching a combined Å–fs–meV resolution. However, the electron kinetic energies commonly employed in most ultrafast electron microscopes (tens to hundreds of keV) far exceeds that of the optical fields (few eV), thereby resulting in small electron–light coupling and thus limiting the emergence of quantum effects beyond the perturbative regime; indeed, in such context the interaction is well described by the classical, point-electron and non-recoil approximations. Here, we theoretically investigate electron–light–matter interactions between optical modes and low-energy electrons with comparable energies, and find substantial quantum and recoil effects imprinted in the spectrum of surface-scattered electrons interacting with both confined, nanoscale optical modes or plane-wave photons.

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Citation Download Citation

Adamantios Synanidis, P. André D. Gonçalves, Claus Ropers, and F. Javier García de Abajo "Quantum effects in the interaction of low-energy electrons with optical fields", Proc. SPIE 13117, Enhanced Spectroscopies and Nanoimaging 2024, 131170T (4 October 2024); https://doi.org/10.1117/12.3027933

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KEYWORDS

Electrons

Near field optics

Quantum effects

Quantum fields

Quantum regime

Electron microscopes

Electron microscopy

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