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.
© 2013 Optical Society of America
Diffraction and Gratings
Original Manuscript: April 9, 2013
Revised Manuscript: May 20, 2013
Manuscript Accepted: May 21, 2013
Published: July 12, 2013
Etienne Brasselet, "Optical vortices from closed-loop subwavelength slits," Opt. Lett. 38, 2575-2577 (2013)