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  • Letter
  • Open Access

Superradiant scattering from evanescent waves

M. Pardal1, R. A. Fonseca1,2, and J. Vieira1

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Phys. Rev. Research 8, L012013 – Published 14 January, 2026

DOI: https://doi.org/10.1103/PhysRevResearch.8.L012013

Abstract

Evanescent waves, such as the ones present at the interface between a laser and an overdense plasma, provide extremely localized fields that are able to induce rapid accelerations in charged particles. We show that such accelerations can generate high-energy, low-divergence, directional photon beams even for moderately relativistic electrons (γ≃10). This process can also lead to superradiant emission of bright, ultrashort pulses of light, as long as the electron bunch is suitably modulated. Although never directly observed, this mechanism should leave clear signatures in laser-plasma acceleration experiments with minimal setup adaptations.

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Phys. Rev. Research 8, L012013– Published 14 January, 2026
  • Received 1 June 2023
  • Accepted 12 November 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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