Recent twists in twisted light: A Perspective on optical vortices from dielectric metasurfaces

  title={Recent twists in twisted light: A Perspective on optical vortices from dielectric metasurfaces},
  author={Marco Piccardo and Antonio Ambrosio},
  journal={Applied Physics Letters},
Optical vortices are the electromagnetic analogue of fluid vortices studied in hydrodynamics. In both cases the traveling wavefront, either made of light or fluid, is twisted like a corkscrew around its propagation axis - an analogy that inspired also the first proposition of the concept of optical vortex. Even though vortices are one of the most fundamental topological excitations in nature, they are rarely found in their electromagnetic form in natural systems, for the exception of energetic… 
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