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arXiv · 2606.16958

Transverse Modulation of Continuous Electron Beams by a Structured Optical Cavity

Marius Constantin Chirita Mihaila·Julie Sk{ý}palová·Martin Kozák
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Abstract

Compact aberration correction at large semi-angles remains a central challenge in electron microscopy. Here we propose a phase plate for continuous electron beams based on the ponderomotive interaction with an intracavity standing wave in a near-concentric Fabry--P\'erot resonator. For electrons propagating along the cavity axis, a standing-wave with Laguerre-Gaussian mode of topological charge $l=1$ imprints an annular phase shift that is opposite in sign to the third-order spherical aberration of a conventional electron lens. For a \(5~\mathrm{keV}\) beam with a convergence semi-angle of \(25~\mathrm{mrad}\), we fully compensate the third-order spherical aberration of an objective lens with \(C_\mathrm{s}=1~\mathrm{mm}\), yielding the transverse width of the corrected probe in the focus of \(\sigma_\mathrm{p}=1.4~\mathrm{\AA}\). The accessible transverse electron phases are set by the supported resonator modal basis and its coherent superpositions.

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Marius Constantin Chirita Mihaila, Julie Sk{ý}palová, Martin Kozák. 2026-06-15. Transverse Modulation of Continuous Electron Beams by a Structured Optical Cavity. https://arxiv.org/abs/2606.16958

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