Spin-to-orbital angular momentum conversion in dielectric metasurfaces.

  title={Spin-to-orbital angular momentum conversion in dielectric metasurfaces.},
  author={Robert C Devlin and Antonio Ambrosio and Daniel Wintz and Stefano Luigi Oscurato and Alexander Y. Zhu and Mohammadreza Khorasaninejad and Jaewon Oh and Pasqualino Maddalena and Federico Capasso},
  journal={Optics express},
  volume={25 1},
Vortex beams are characterized by a helical wavefront and a phase singularity point on the propagation axis that results in a doughnut-like intensity profile. These beams carry orbital angular momentum proportional to the number of intertwined helices constituting the wavefront. Vortex beams have many applications in optics, such as optical trapping, quantum optics and microscopy. Although beams with such characteristics can be generated holographically, spin-to-orbital angular momentum… 

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