Journal
JOURNAL OF OPTICS
Volume 15, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2040-8978/15/2/025712
Keywords
refractive spiral phase plate; optical vortex; thin element; transmittance function; microrelief; Huygens-Fresnel principle
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Funding
- Ministry of Education and Science of Russian Federation [8027]
- Russian Federation Presidential grants for support of the leading scientific schools [NSh-4128.2012.9]
- Young Candidate of Science grant [MK-3912.2012.2]
- Russian Foundation Basic Research [12-07-00269, 12-07-31115, 12-07-31117, 13-07-97008]
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Using a revised Kirchhoff diffraction integral and the finite-difference time-domain method we show that an optical vortex generated by a refractive spiral plate with a relief step has an asymmetric profile. The annular diffraction pattern in the optical vortex beam cross-section is found to be disturbed not only for near-field diffraction but also for the Fresnel zone. For a spiral phase plate with topological charge 3, fabricated on a resist, optical vortex asymmetry has been shown experimentally by near-field scanning optical microscopy.
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