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Proceedings Paper

Vectorial vortices obtained with quantized Pancharatnam-Berry phase optical elements
Author(s): Erez Hasman; Avi Niv; Gabriel Biener; Vladimir Kleiner
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Paper Abstract

Vectorial vortices obtained with quantized Pancharatnam-Berry phase optical elements (PBOEs) are presented. A vectorial vortex occurs around a point where a scalar vortex is centered in at least one of the scalar components of the vectorial wave field. PBOEs utilize the geometric phase that accompanies space-variant polarization manipulations to achieve a desired phase modification. The geometric phase is formed through the use of discrete computer-generated space-variant subwavelength dielectric gratings. By discretely controlling the local grating orientation, we could form complex vectorial fields. Propagation-invariant vectorial Bessel beams with linearly polarized axial symmetry were experimentally demonstrated. Moreover, a new class of vectorial vortices based on coherent addition of two orthogonal circular polarized Bessel beams of identical order, but with different propagation constant is presented. The transversely space-variant axially symmetric polarization distributions of these vectorial fields rotate as they propagate while still maintaining a propagation-invariant Bessel intensity distribution. The polarization properties were verified by both full space-variant polarization analysis and measurements. Rotating intensity patterns were also demonstrated by transmitting the vectorial vortices through a linear polarizer.

Paper Details

Date Published: 9 February 2006
PDF: 8 pages
Proc. SPIE 6131, Nanomanipulation with Light II, 613107 (9 February 2006); doi: 10.1117/12.642934
Show Author Affiliations
Erez Hasman, Technion-Israel Institute of Technology (Israel)
Avi Niv, Technion-Israel Institute of Technology (Israel)
Gabriel Biener, Technion-Israel Institute of Technology (Israel)
Vladimir Kleiner, Technion-Israel Institute of Technology (Israel)

Published in SPIE Proceedings Vol. 6131:
Nanomanipulation with Light II
David L. Andrews, Editor(s)

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