μeV electron spectromicroscopy using free-space light

Yves Auad, Eduardo J. C. Dias, Marcel Tencé, Jean-Denis Blazit, Xiaoyan Li, Luiz Fernando Zagonel, Odile Stéphan, Luiz H. G. Tizei, F. Javier García de Abajo () and Mathieu Kociak ()
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Yves Auad: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Eduardo J. C. Dias: ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Marcel Tencé: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Jean-Denis Blazit: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Xiaoyan Li: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Luiz Fernando Zagonel: University of Campinas - UNICAMP
Odile Stéphan: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
Luiz H. G. Tizei: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides
F. Javier García de Abajo: ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology
Mathieu Kociak: Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract The synergy between free electrons and light has recently been leveraged to reach an impressive degree of simultaneous spatial and spectral resolution, enabling applications in microscopy and quantum optics. However, the required combination of electron optics and light injection into the spectrally narrow modes of arbitrary specimens remains a challenge. Here, we demonstrate microelectronvolt spectral resolution with a sub-nanometer probe of photonic modes with quality factors as high as 104. We rely on mode matching of a tightly focused laser beam to whispering gallery modes to achieve a 108-fold increase in light-electron coupling efficiency. By adapting the shape and size of free-space optical beams to address specific physical questions, our approach allows us to interrogate any type of photonic structure with unprecedented spectral and spatial detail.

Date: 2023
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DOI: 10.1038/s41467-023-39979-0

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