Scientific Results

Extreme high field plasmonics: Electron acceleration and XUV harmonic generation from ultrashort surface plasmons

Year: 2019

Authors: Macchi A., G. Cantono, L. Fedeli, F. Pisani, T. Ceccotti

Autors Affiliation: 1) National Institute of Optics, National Research Council (CNR/INO), Adriano Gozzini Laboratory, via Giuseppe Moruzzi 1, 56124 Pisa, Italy
2) Enrico Fermi Department of Physics, University of Pisa, largo Bruno Pontecorvo 3, 56127 Pisa, Italy
3) Department of Physics, Lund University, P.O. Box 118, SE-22100 Lund, Sweden
4) Department of Energy, Politecnico di Milano, 20133 Milano, Italy
5) CEA/DSM/IRAMIS/LIDYL, CEA Saclay, 91191 Gif-sur-Yvette, France

Abstract: Experiments on the excitation of propagating surface plasmons (SPs) by an ultrashort, high intensity laser interaction with grating targets are reviewed. At intensities exceeding 1019 W cm−2 on target, i.e., in the strongly relativistic regime of electron dynamics, multi-megaelectronvolt electrons are accelerated by the SP field as dense bunches collimated in a near-tangent direction. By the use of a suitable blazed grating, the bunch charge can be increased up to ≈660 pC. Intense extreme ultraviolet high harmonics (HHs) diffracted by the grating are observed when a plasma with a submicrometer scale is produced at the target surface by a controlled prepulse. When the SP is excited, the HHs are strongly enhanced in a direction quasi-parallel to the electrons. Simulations suggest that the HHs are boosted by nanobunching in the SP field of the electrons which scatter the laser field. Besides the static and dynamic tailoring of the target density profile, further control of electron and HH emission might be achieved by changing the SP duration using a laser pulse with a rotating wavefront. The latter technique may allow the production of nearly single-cycle SPs.

Journal/Review: PHYSICS OF PLASMAS

Volume: 26      Pages from: 042114-1  to: 042114-10

KeyWords: high field plasmonics, ultrashort radiation sources, electron acceleration, high harmonic generation
DOI: 10.1063/1.5086537

English