Eduardo Arqué López,1 Valerio Di Giulio,1 Javier García de Abajo1,2
1ICFO - Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology (Spain) 2Institució Catalana de Recerca i Estudis Avançats (Spain)
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We theoretically reveal novel quantum effects in the interaction between free electrons and optically illuminated multilevel atomic systems. Specifically, we show that the resulting electron energy-loss spectra are radically altered in the presence of intense laser irradiation, giving rise to transition energy shifts and new loss features associated with the combined action of photon and electron exchanges with the atomic system, in analogy to Raman scattering. Besides their fundamental interest, our results provide the basis for a new form of spectrally resolved microscopy in which the external illumination is used to enhance the spectral resolution and strength of electron-atom interactions.
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Eduardo Arqué López, Valerio Di Giulio, Javier García de Abajo, "Optically enhanced electron-atom interaction," Proc. SPIE PC12009, Quantum Sensing and Nano Electronics and Photonics XVIII, PC120090R (5 March 2022); https://doi.org/10.1117/12.2609025