6 April 2017 Tight focusing of laser light propagated through subwavelength micropolarizer using Fresnel zone plate
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Proceedings Volume 10342, Optical Technologies for Telecommunications 2016; 103420R (2017) https://doi.org/10.1117/12.2270655
Event: XIV International Scientific and Technical Conference on Optical Technologies in Telecommunications, 2016, Samara, Russian Federation
Abstract
We discuss a four-Sector transmission Polarization Converter that enables the conversion of linearly polarized incident light into an azimuthally polarized beam. The resulting azimuthally polarized beam is characterized by a phase shift of π between the diametrically opposite beam points. Using scanning near-field optical microscope we experimentally show that by placing a Fresnel zone plate of focus 532 nm behind the four-sector micropolarizer, light can be focused into a subwavelength focal spot with smaller and larger sizes measuring FWHM = 0.46λ and FWHM = 0.57λ Numerically obtained focal spot of the transverse E-field component, which is measured by our scanning near-field optical microscope, has diameters FWHMx = 0.42λ and FWHMy = 0.59λ.
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Sergey S. Stafeev, Anton G. Nalimov, Liam O'Faolain, Maria V. Kotlyar, Victor V. Kotlyar, "Tight focusing of laser light propagated through subwavelength micropolarizer using Fresnel zone plate", Proc. SPIE 10342, Optical Technologies for Telecommunications 2016, 103420R (6 April 2017); doi: 10.1117/12.2270655; https://doi.org/10.1117/12.2270655
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