-A A +A
In this paper we report the measurement of laser-driven proton acceleration obtained by irradiating nanotube array targets with ultrashort laser pulses at an intensity in excess of 10 20 W cm− 2. The energetic spectra of forward accelerated protons show a larger flux and a higher proton cutoff energy if compared to flat foils of comparable thickness. Particle-In-Cell 2D simulations reveal that packed nanotube targets favour a better laser-plasma coupling and produce an efficient generation of fast electrons moving through the target. Due to their sub-wavelength size, the propagation of em field into the tubes is made possible by the excitation of Surface Plasmon Polaritons, travelling down to the end of the target and assuring a continuous electron acceleration. The higher amount and energy of these electrons result in turn in a stronger electric sheath field on the rear surface of the target and in a more efficient …
IOP Publishing
Publication date: 
2 Oct 2020

G Cristoforetti, F Baffigi, F Brandi, G D’Arrigo, A Fazzi, L Fulgentini, D Giove, P Koester, L Labate, G Maero, D Palla, M Romé, R Russo, D Terzani, P Tomassini, LA Gizzi

Biblio References: 
Volume: 62 Issue: 11 Pages: 114001
Plasma Physics and Controlled Fusion