  When a relativistic laser pulse with high photon density interacts with a
specially tailored thin foil target, a strong torque is exerted on the
resulting spiral-shaped foil plasma, or light fan. Because of its structure,
the latter can gain significant orbital angular momentum (OAM), and the
opposite OAM is imparted to the reflected light, creating a twisted
relativistic light pulse. Such an interaction scenario is demonstrated by
particle-in-cell simulation as well as analytical modeling, and should be
easily verifiable in the laboratory. As important characters, twisted
relativistic light pulse has strong torque and ultra-high OAM density.

Plasma Physics;Optics