Towards Laser-Driven, Quasi-Monochromatic Ion Bunches via Ultrathin Targets Nano-Structuring?

The conditions for achieving the laser acceleration of quasi‐monochromatic ion bunches with present‐day, fs laser systems are theoretically discussed. The study suggests the possibility of achieving quasi‐monochromaticity via irradiation of double‐layer, nano‐structured foils and the conjecture is numerically confirmed by means of two dimensional, Particle‐In‐Cell (PIC) simulations. A feasible setup in order to experimentally validate this approach is thus proposed.