Tight focusing of a quasi-cylindrical optical vortex

In this article, we numerically investigate the tight focusing of a quasi-cylindrical optical vortex with azimuthal polarization and a wavelength of 532 nm using a Fresnel zone plate with a numerical aperture of NA = 0.95. It is shown that the focal spot produced by a beam with six sectors does not...

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Bibliographic Details
Published in:Optics communications 2017-11, Vol.403, p.277-282
Main Authors: Stafeev, S.S., Kotlyar, V.V.
Format: Article
Language:English
Subjects:
Azimuthally polarized light
Optical vortex
Tight focusing
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Summary:In this article, we numerically investigate the tight focusing of a quasi-cylindrical optical vortex with azimuthal polarization and a wavelength of 532 nm using a Fresnel zone plate with a numerical aperture of NA = 0.95. It is shown that the focal spot produced by a beam with six sectors does not differ from the ideally azimuthally polarized optical vortex; a difference in the focal spot diameter does not exceed 0.001 of the wavelength. •The tight focusing of a quasi-cylindrical optical vortex was numerically investigated.•Numerical simulation was performed using the Richards–Wolf formula.•Focal spots produced by a beam with 6 sectors do not differ from ideal optical vortex.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2017.07.054