Subwavelength micropolarizer in a gold film for visible light
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We have designed and fabricated a 100 μm x 100 μm four-sector binary subwavelength reflecting polarization microconverter in a gold film. Using finite-difference time-domain-aided numerical simulations and experiments, the micropolarizer was shown to convert an incident linearly polarized Gaussian beam of wavelength 532 nm into an azimuthally polarized beam. Conditions for generating on-axis regions of nonzero intensity when using propagating optical vortices with different initial polarization were deduced. By putting a spiral phase plate into an azimuthally polarized beam, the intensity pattern was shown to change from diffraction rings to a central peak.
Kotlyar , V V , Stafeev , S S , Kotlyar , M V , Nalimov , A G & O'Faolain , L 2016 , ' Subwavelength micropolarizer in a gold film for visible light ' , Applied Optics , vol. 55 , no. 19 , pp. 5025-5032 . https://doi.org/10.1364/AO.55.005025
© 2016 Optical Society of America. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1364/AO.55.005025