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We investigate the production of hot electrons from the interaction ofrelativistically intense ($I> 10^{18} W/cm^{2}$) ultra-short (25 fs) laserpulses with sub-wavelength grating target. We measure the hot electron angulardistribution and energy spectra for grating target and compare them with thosefrom a planar mirror target. We observe that hot electrons are emitted in acollimated beam along the specular direction of the grating target. From themeasured electron energy spectra we see electron temperature for grating ishigher than the mirror, suggesting a higher electron yield and hence a strongercoupling with the laser. We performed numerical simulations which are in goodagreement with experimental results, offer insights into the accelerationmechanism by resulting electric and magnetic fields. Such collimated fastelectron beams have a wide range of applications in applied and fundamentalscience.

Collimated hot electron generation from sub-wavelength grating target irradiated by a femtosecond laser pulse of relativistic intensity