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The generation of ultra-strong attosecond pulses through laser-plasmainteractions offers the opportunity to surpass the intensity of any knownlaboratory radiation source, giving rise to new experimental possibilities,such as quantum electrodynamical tests and matter probing at extremely shortscales. Here we demonstrate that a laser irradiated plasma surface can act asan efficient converter from the femto- to the attosecond range, giving adramatic rise in pulse intensity. Although seemingly similar schemes have beenpresented in the literature, the present setup deviates significantly fromprevious attempts. We present a new model describing the nonlinear process ofrelativistic laser-plasma interaction. This model, which is applicable to amultitude of phenomena, is shown to be in excellent agreement withparticle-in-cell simulations. We provide, through our model, the necessarydetails for an experiment to be performed. The possibility to reach intensitiesabove 10^26 W/cm^2, using upcoming 10 petawatt laser sources, is demonstrated.

Ultrarelativistic nanoplasmonics as a new route towards extreme intensity attosecond pulses