Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

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Abstract

The emission of high-order harmonics in the extreme ultraviolet range from the interaction of a short, intense laser pulse with a grating target is investigated experimentally. When resonantly exciting a surface plasmon, both the intensity and the highest order observed for the harmonic emission along the grating surface increase with respect to a flat target. Harmonics are obtained when a suitable density gradient is preformed at the target surface, demonstrating the possibility to manipulate the grating profile on a nanometric scale without preventing the surface plasmon excitation. In support of this, the harmonic emission is spatiotemporally correlated to the acceleration of multi-MeV electron bunches along the grating surface. Particle-in-cell simulations reproduce the experimental results and give insight on the mechanism of high harmonic generation in the presence of surface plasmons.

Detaljer

Författare
  • G. Cantono
  • L. Fedeli
  • A. Sgattoni
  • A. Denoeud
  • L. Chopineau
  • F. Réau
  • T. Ceccotti
  • A. Macchi
Externa organisationer
  • University of Paris-Saclay
  • University of Paris-Sud
  • Istituto Nazionale di Ottica
  • University of Pisa
  • Polytechnic University of Milan
  • Pierre and Marie Curie University
  • Versailles Saint-Quentin-en-Yvelines University
Originalspråkengelska
Artikelnummer264803
TidskriftPhysical Review Letters
Volym120
Utgåva nummer26
StatusPublished - 2018 jun 28
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa