Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons

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.
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Article dans une revue
Phys.Rev.Lett., 2018, 120 (26), pp.264803. 〈10.1103/PhysRevLett.120.264803〉
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Soumis le : dimanche 22 juillet 2018 - 17:36:50
Dernière modification le : mardi 19 février 2019 - 00:54:34

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G. Cantono, L. Fedeli, A. Sgattoni, A. Denoeud, L. Chopineau, et al.. Extreme Ultraviolet Beam Enhancement by Relativistic Surface Plasmons. Phys.Rev.Lett., 2018, 120 (26), pp.264803. 〈10.1103/PhysRevLett.120.264803〉. 〈hal-01846694〉



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