Q-plate

A method for generating orbital angular momentum of light (OAM) is based on the SAM-OAM coupling that may occur in a medium which is both anisotropic and inhomogeneous. In particular, the so-called q-plate is a device, currently realized using liquid crystals, polymers or sub-wavelength gratings, which can generate OAM by exploiting a SAM sign-change. In this case, the OAM sign is controlled by the input polarization.[1][2]

References

  1. ↑ Marrucci, L.; Manzo, C.; Paparo, D. (2006-04-28). "Optical Spin-to-Orbital Angular Momentum Conversion in Inhomogeneous Anisotropic Media". Physical Review Letters 96 (16): 163905. doi:10.1103/PhysRevLett.96.163905.
  2. ↑ Karimi, Ebrahim; Piccirillo, Bruno; Nagali, Eleonora; Marrucci, Lorenzo; Santamato, Enrico (2009-06-08). "Efficient generation and sorting of orbital angular momentum eigenmodes of light by thermally tuned q-plates". Applied Physics Letters 94 (23): 231124. doi:10.1063/1.3154549. ISSN 0003-6951.
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