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FACULTY OF PHYSICS

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2026-06-11 23:58

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Conference: Bucharest University Faculty of Physics 2026 Meeting

Section: Theoretical and Computational Physics, Applied Mathematics

Title:

Orbital angular momentum transfer through the scattering of a Laguerre-Gauss beam by an electron bunch

Authors:

Gabriel MAJERI (1), Mădălina BOCA (1)

^*
Affiliation:

1) University of Bucharest

E-mail

gabriel.majeri@unibuc.ro, madalina.boca@unibuc.ro

Keywords:

orbital angular momentum of light, Laguerre-Gauss modes, numerical simulations, Compton scattering

Abstract:

Light beams (solutions of the Maxwell field equations with finite spatial extent or rapidly decaying tails) can carry angular momentum in the form of orbital angular momentum (OAM). In particular, this is true for the Laguerre-Gauss modes of a Gaussian beam, which can nowadays be generated in high-power lasers. A question of practical interest is how this OAM can be transferred by the laser pulse to charged particles, such as electrons. We numerically integrate the trajectories of electrons under the influence of a short laser pulse, confirming they gain angular momentum from the interaction, then compute the electric and magnetic field patterns observed on a simulated detector, far away from the initial position of the electron bunch. Improving our understanding of this kind of light could help us develop experiments with applications in nuclear physics.

References:

Jackson, John David. 1999. Classical Electrodynamics. 3rd ed. Wiley.

Thomas, A. G. R. 2010. “Algorithm for Calculating Spectral Intensity Due to Charged Particles in Arbitrary Motion.” Physical Review Special Topics - Accelerators and Beams 13 (2): 020702. https://doi.org/10.1103/PhysRevSTAB.13.020702.

Petrillo, V., G. Dattoli, I. Drebot, and F. Nguyen. 2016. “Compton Scattered X-Gamma Rays with Orbital Momentum.” Physical Review Letters 117 (12): 123903. https://doi.org/10.1103/PhysRevLett.117.123903.

Toma, Petru-Vlad, Sebastian Micluţa-Câmpeanu, Mădălina Boca, Alexandru Nicolin, and Virgil Băran. 2023. “Scaling Properties of Angular Momentum Transfer to Charged Particles under Laguerre-Gauss Laser Pulse.” AIP Conference Proceedings 2843 (1): 020005. https://doi.org/10.1063/5.0150590.

Toma, Petru-Vlad, Andrei Cristian Opinca, Virgil Baran, and Madalina Boca. 2025. “Coherent Nonlinear Thomson Scattering of Laguerre-Gauss Beams on an Electron Sheet.” Physical Review A 111 (1): 013101. https://doi.org/10.1103/PhysRevA.111.013101.

Acknowledgement:

The authors thank the University of Bucharest for providing them with access to the high-performance computing (HPC) cluster of the University’s Advanced Computing Center (ACC-UB).