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: Univ Paris Saclay, CEA Saclay, CEA, LIDYL,CNRS, F-91191 Gif Sur Yvette, France; Univ Paris 11, F-91400 Orsay, France; CNR, INO, A Gozzini Unit, I-56124 Pisa, Italy; Univ Pisa, Enrico Fermi Dept Phys, I-56127 Pisa, Italy; Politecn Milan, Dept Energy, I-20133 Milan, Italy; LULI UPMC Sorbonne Univ, CNRS, Ecole Polytech, CEA, F-75005 Paris, France; UPMC Sorbonne Univ, LESIA, Observ Paris, CNRS, F-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: High-harmonic-generation; High-order-harmonics; Intensity; Mirrors
DOI: 10.1103/PhysRevLett.120.264803

ImpactFactor: 9.227
Citations: 20
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