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6 June 2018 Subwavelength focusing of azimuthally polarized optical vortex
S. S. Stafeev, A. G. Nalimov, L. O'Faolain, M. V. Kotlyar, V. V. Kotlyar
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Proceedings Volume 10774, Optical Technologies in Telecommunications 2017; 107740Z (2018) https://doi.org/10.1117/12.2318801
Event: XV International Scientific and Technical Conference on Optical Technologies in Telecommunications, 2017, Kazan, Russian Federation
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.
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Citation Download Citation
S. S. Stafeev, A. G. Nalimov, L. O'Faolain, M. V. Kotlyar, and V. V. Kotlyar "Subwavelength focusing of azimuthally polarized optical vortex", Proc. SPIE 10774, Optical Technologies in Telecommunications 2017, 107740Z (6 June 2018); https://doi.org/10.1117/12.2318801
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KEYWORDS
Spiral phase plates
Optical vortices
Polarization
Polarizers
Zone plates
Diffraction gratings
Gaussian beams
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