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We propose to use ultra-high intensity laser pulses with wavefront rotation(WFR) to produce short, ultra-intense surface plasma waves (SPW) on gratingtargets for electron acceleration. Combining a smart grating design withoptimal WFR conditions identified through simple analytical modeling andparticle-in-cell simulation allows to decrease the SPW duration (down to fewoptical cycles) and increase its peak amplitude. In the relativistic regime,for $I\lambda_0^2=3.4 \times 10^{19}{\rm W/cm^2\mu m^2}$, such SPW are found toaccelerate high-charge (few 10's of pC), high-energy (up to 70 MeV) andultra-short (few fs) electron bunches.

Ultrashort high energy electron bunches from tunable surface plasma waves driven with laser wavefront rotation