Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

Year: 2018

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

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

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.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 120 (26)      Pages from: 264803-1  to: 264803-5

More Information: We acknowledge M. Kveton (HoloPlus, Prague, Czech Republic) for the grating manufacturing and the computational support from HPC Cluster CNAF (Bologna, Italy), with the precious assistance of S. Sinigardi. The research received financial support from Universite Franco-Italienne (Vinci program 2015, Grant No. C2-92) and from Agence Nationale pour la Recherche (Grant No. ANR-14-CE32-0011).
KeyWords: surface plasmons; high field plasmonics; high harmonics; XUV pulses; ultrashort radiation pulses
DOI: 10.1103/PhysRevLett.120.264803

Citations: 16
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