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Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

  Articoli su Riviste JCR/ISI  (anno 2018)

Autori:  Cantono G., Fedeli L., Sgattoni A., Denoeud A., Chopineau L., Réau F., Ceccotti T., Macchi A

Affiliazione Autori:  1) LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France 2) Université Paris Sud, Paris, 91400 Orsay, France 3) National Institute of Optics, National Research Council (CNR/INO) A. Gozzini unit, 56124 Pisa, Italy 4) Enrico Fermi Department of Physics, University of Pisa, 56127 Pisa, Italy 5) Department of Energy, Politecnico di Milano, 20133 Milano, Italy 6) LULI-UPMC: Sorbonne Universités, CNRS, École Polytechnique, CEA, 75005 Paris, France 7) LESIA, Observatoire de Paris, CNRS, UPMC: Sorbonne Universites, 92195 Meudon, France

Riassunto:  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.

Rivista/Giornale:  PHYSICAL REVIEW LETTERS
Volume n.:  120      Pagine da: 264803-1  a: 264803-5
Collegamento Web del Prodotto: Clicca qui


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