Arbitrary optical wavefront shaping via spin-to-orbit coupling
  Converting spin angular momentum to orbital angular momentum has been shown to be a practical and efficient method for generating optical beams carrying orbital angular momentum and possessing a space-varying polarized field. Here, we present novel liquid crystal devices for tailoring the wavefront of optical beams through the Pancharatnam-Berry phase concept. We demonstrate the versatility of these devices by generating an extensive range of optical beams such as beams carrying $\pm200$ units of orbital angular momentum along with Bessel, Airy and Ince-Gauss beams. We characterize both the phase and the polarization properties of the generated beams, confirming our devices' performance. 
Hugo Larocque, J\'er\'emie Gagnon-Bischoff, Fr\'ed\'eric Bouchard,   Robert Fickler, Jeremy Upham, Robert W. Boyd, and Ebrah...
physics.optics