26 April 2018 Tight focusing of a nonhomogeneously polarized optical vortex
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In this work, we fabricated and studied the performance of a 100×100-μm four-sector binary subwavelength grating polarizer 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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S. S. Stafeev, S. S. Stafeev, A. G. Nalimov, A. G. Nalimov, L. O'Faolain, L. O'Faolain, M. V. Kotlyar, M. V. Kotlyar, V. V. Kotlyar, V. V. Kotlyar, } "Tight focusing of a nonhomogeneously polarized optical vortex", Proc. SPIE 10717, Saratov Fall Meeting 2017: Laser Physics and Photonics XVIII; and Computational Biophysics and Analysis of Biomedical Data IV, 107170N (26 April 2018); doi: 10.1117/12.2315598; https://doi.org/10.1117/12.2315598

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