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Subwavelength focusing of azimuthally polarized optical vortex
Author(s): S. S. Stafeev; A. G. Nalimov; L. O'Faolain; M. V. Kotlyar; V. V. Kotlyar
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Paper Abstract

In this work, we numerically investigated focusing of a quasi-cylindrical optical vortex with azimuthal polarization and a wavelength of 532 nm. It was shown that the focal spot produced by a beam with four sectors focused with a Fresnel zone plate with a numerical aperture of NA = 0.95 does not differ from the ideally azimuthally polarized optical vortex; the difference in the focal spot diameter does not exceed 0.03λ. The four-sector binary subwavelength grating polarizer was fabricated in a golden film. It was experimentally demonstrated that a linearly polarized 532-nm Gaussian beam reflected at the polarizer was converted to an azimuthally polarized beam. Putting a spiral phase plate (SPP) with the topological charge n = 1 into the azimuthally polarized beam from the micropolarizer was experimentally shown to enable the conversion of the annular intensity pattern into a central intensity peak.

Paper Details

Date Published: 6 June 2018
PDF: 8 pages
Proc. SPIE 10774, Optical Technologies in Telecommunications 2017, 107740Z (6 June 2018); doi: 10.1117/12.2318801
Show Author Affiliations
S. S. Stafeev, Image Processing Systems Institute (Russian Federation)
Samara National Research Univ. (Russian Federation)
A. G. Nalimov, Image Processing Systems Institute (Russian Federation)
Samara National Research Univ. (Russian Federation)
L. O'Faolain, Cork Institute of Technology (Ireland)
M. V. Kotlyar, Samara National Research Univ. (Russian Federation)
V. V. Kotlyar, Image Processing Systems Institute (Russian Federation)
Samara National Research Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 10774:
Optical Technologies in Telecommunications 2017
Vladimir A. Andreev; Anton V. Bourdine; Vladimir A. Burdin; Oleg G. Morozov; Albert H. Sultanov, Editor(s)

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