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Ponderomotive achromat for electron optics: Radially polarized annular focusing and a round-lens corrector regime

Yuuki Uesugi1,* and Yuichi Kozawa2

  • *Contact author: yuuki.uesugi@aist.go.jp
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Phys. Rev. Research 8, 033300 – Published 11 September, 2026

DOI: https://doi.org/10.1103/5s6w-2dt5

Abstract

Ponderomotive electron optics has attracted attention because structured optical fields provide round-lens functionalities, including negative lens power and negative spherical aberration, that are difficult to achieve with conventional Einzel and solenoid lenses. How ponderomotive lenses disperse with electron energy and whether that dispersion can be engineered for achromatization have remained largely unexplored. Here, we show that the transverse and longitudinal components of a vector optical field exhibit distinct energy dispersions because a relativistic correction modifies the effective lens action of the component polarized parallel to the electron velocity. In a radially polarized Bessel field coaxial with the electron beam, the two components form spatially colocated J12- and J02-type ponderomotive potentials whose relative weights depend on the electron energy, the Bessel cone angle, and the propagation direction of the light relative to the electrons. Using a local Abbe number defined in the energy domain, we find that this single field can operate as a self-achromatic round lens. We further construct zero-separation doublets—with a magnetic objective-lens model or an azimuthally polarized Bessel lens—that simultaneously cancel the first-order axial chromatic- and third-order spherical-aberration coefficients at a fixed electron-optical focal length, with the useful solutions occurring for counterpropagating light. Finite-aperture calculations at optical wavelengths of 1064nm and 10.6μm relate the achievable probe size to the required optical power, and at 10.6μm they identify a low-energy, large-energy-spread regime in which the corrected doublets outperform the magnetic objective-lens model. The required optical power is compatible with demonstrated near-infrared ultrashort-pulse sources, so a single-pass proof-of-principle experiment is within reach.

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Phys. Rev. Research 8, 033300– Published 11 September, 2026
  • Received 10 March 2026
  • Accepted 24 August 2026
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