Journal
OPTICS COMMUNICATIONS
Volume 251, Issue 4-6, Pages 306-314Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2005.03.002
Keywords
helical phase; spiral element; subwavelength grating; space-variant grating; singular optics; optical vortex
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The formation of spiral phase elements producing helical beams with different topological charges is presented. The elements consist of discrete space-variant subwavelength dielectric gratings. We demonstrate our approach by fabricating elements for circularly polarized laser radiation with a wavelength of 10.6 mu m. The resulting helical phases, as well as the birefrigent parameters of the element, are measured by analyzing the polarization-dependency of the elements along with the self-interference characteristics of the emerging beams. (c) 2005 Elsevier B.V. All rights reserved.
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