Optical vortices from closed-loop subwavelength slits.
We report on the singular shaping of light using closed-loop subwavelength slits whose shape is homeomorphic to the circle. Various sets of optical phase singularities can be generated depending on the given closed path whose geometry tailors the spin-orbit interaction for the light that passes through the curved slit. Here three families of closed-loop curves are considered--polygons, hypocycloids, and epicycloids.
University of Bordeaux, LOMA, UMR 5798, Talence, France. e.brasselet@loma.u‑bordeaux1.fr
Etienne
E
Brasselet