Multiple vortices with different topological charges are formed by the use of two sequential geometric phase elements. These elements are realized by quasi-periodic subwavelength gratings. The first element is a spiral phase element and the second element is a spherical phase element. We provide a theoretical analysis and an experimental demonstration of the formation of the multiple vortices that comprise scalar vortices and a vectorial vortex.
© 2006 Optical Society of America
Diffraction and Gratings
Original Manuscript: February 15, 2006
Revised Manuscript: March 21, 2006
Manuscript Accepted: March 24, 2006
Gabriel Biener, Yuri Gorodetski, Avi Niv, Vladimir Kleiner, and Erez Hasman, "Manipulation of polarization-dependent multivortices with quasi-periodic subwavelength structures," Opt. Lett. 31, 1594-1596 (2006)