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Electron Acceleration by Relativistic Surface Plasmons in Laser-Grating Interaction

Abstract : The generation of energetic electron bunches by the interaction of a short, ultraintense (I>10 19   W/cm 2 ) laser pulse with “grating” targets has been investigated in a regime of ultrahigh pulse-to-prepulse contrast (10 12 ). For incidence angles close to the resonant condition for surface plasmon excitation, a strong electron emission was observed within a narrow cone along the target surface, with energy spectra peaking at 5–8 MeV and total charge of ∼100  pC . Both the energy and the number of emitted electrons were strongly enhanced with respect to simple flat targets. The experimental data are closely reproduced by three-dimensional particle-in-cell simulations, which provide evidence for the generation of relativistic surface plasmons and for their role in driving the acceleration process. Besides the possible applications of the scheme as a compact, ultrashort source of MeV electrons, these results are a step forward in the development of high-field plasmonics.
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https://hal-cea.archives-ouvertes.fr/cea-01274138
Contributor : Caroline Lebe <>
Submitted on : Monday, February 15, 2016 - 2:37:21 PM
Last modification on : Friday, July 31, 2020 - 9:24:06 AM

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L. Fedeli, A. Sgattoni, G. Cantono, D. Garzella, F. Réau, et al.. Electron Acceleration by Relativistic Surface Plasmons in Laser-Grating Interaction. Physical Review Letters, American Physical Society, 2016, 116 (1), pp.015001. ⟨10.1103/PhysRevLett.116.015001⟩. ⟨cea-01274138⟩

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