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By using multi-dimensional particle-in-cell simulation, we present a newregime of stable proton beam acceleration which takes place when a two-specieshaped foil is illuminated by a circularly polarized laser pulse. It isobserved that the lighter protons are nearly-instantaneously separated from theheavier carbon ions due to the charge-to-mass ratio difference. The heavy-ionslayer extensively expands in space and acts to buffer the proton layer from theRayleigh-Taylor-like (RT) instability that would have otherwise degraded theproton beam acceleration. A simple three-interface model is formulated toqualitatively explain the stabilization of the light-ions acceleration. Due tothe absence of the RT-like instability, the produced high qualitymono-energetic proton bunch can be well maintained even after the laser-foilinteraction concludes.

Stable laser-driven proton beam acceleration from a two-specie ultra-thin foil