Spiral phase elements with topological charges based on space-variant Pancharatnam–Berry phase optical elements are presented. Such elements can be achieved by use of continuous computer-generated space-variant subwavelength dielectric gratings. We present a theoretical analysis and experimentally demonstrate spiral geometrical phases for infrared radiation at a wavelength of 10.6µm .
© 2002 Optical Society of America
(050.1970) Diffraction and gratings : Diffractive optics
(050.2770) Diffraction and gratings : Gratings
(260.5430) Physical optics : Polarization
(350.1370) Other areas of optics : Berry's phase
Gabriel Biener, Avi Niv, Vladimir Kleiner, and Erez Hasman, "Formation of helical beams by use of Pancharatnam-Berry phase optical elements," Opt. Lett. 27, 1875-1877 (2002)