Tight focusing of azimuthally polarized optical vortex produced by subwavelength grating

S.S. Stafeev, A.G. Nalimov, M.V. Kotlyar, Liam O'Faolain, V.V. Kotlyar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)
1 Downloads (Pure)

Abstract

Focusing of an optical vortex with sectorial azimuthal polarization is numerically investigated. An effect of sector numbers on the results of focusing is estimated. It is shown that the focal spot produced by a beam with six sectors does not differ from the ideally azimuthally polarized optical vortex; a difference in the focal spot diameter does not exceed 0.001 of the wavelength. For a four-sectoral beam, the difference does not exceed 0.028 of the wavelength. We have investigated a four-Sector transmission Polarization Converter for a wavelength of 633 nm, that enables the conversion of a linearly polarized incident beam into a mixture of linearly and azimuthally polarized beams. It was experimentally shown that light propagated through the four-Sector transmission Polarization Converter and focused by Fresnel zone plate with a focal length of 532 nm produces focal spot with diameters 0.46 and 0.57 of wavelength.
Original languageEnglish
Title of host publication3rd International Conference "Information Technology and Nanotechnology", ITNT-2017, 25-27 April 2017, Samara, Russia
EditorsVictor Soifer, Nikolay Kazanskiy, Olga Korotkova, Sergei Sazhin
PublisherElsevier
Pages83-89
DOIs
Publication statusPublished - 2017
EventIII International Conference and Youth School "Information Technologies and Nanotechnologies" (ITNT-2017) - Samara National Research University, Samara, Russian Federation
Duration: 25 Apr 201727 Apr 2017
Conference number: 3
http://itnt-conf.org/index.php/glavnaya/arkhiv/itnt-2017

Publication series

NameProcedia Engineering
Volume201
ISSN (Print)1877-7058
ISSN (Electronic)1877-7058

Conference

ConferenceIII International Conference and Youth School "Information Technologies and Nanotechnologies" (ITNT-2017)
Abbreviated titleITNT-2017
Country/TerritoryRussian Federation
CitySamara
Period25/04/1727/04/17
Internet address

Keywords

  • Tight focusing
  • Optical vortex
  • Azimuthally polarized light
  • Fresnel zone plate
  • Subwavelength grating
  • Polarization conversion

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