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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 15 — Aug. 1, 2013
  • pp: 2742–2745

Modulation of a super-Gaussian optical needle with high-NA Fresnel zone plate

Tao Liu, Jiubin Tan, Jian Liu, and Hongting Wang  »View Author Affiliations

Optics Letters, Vol. 38, Issue 15, pp. 2742-2745 (2013)

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A high NA Fresnel zone plate (FZP) is studied using vectorial angular spectrum theory for realizing the sharpest possible super-Gaussian optical needle with purely longitudinal polarization illuminated by a radially polarized vector beam. Strong dispersion of the FZP results in a light field resembling a super-Gaussian optical needle by selecting an optimal FZP structural wavelength relative to the illumination wavelength and inserting a narrow comb window function into the center-shaded FZP. A 25 μm long longitudinally polarized flattop optical needle with a transverse beam width of about 0.366λ is focused at a distance of 222.5 μm away from a binary amplitude 3.46 mm diameter FZP for a 532.4 nm wavelength in free space.

© 2013 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(050.1940) Diffraction and gratings : Diffraction
(260.5430) Physical optics : Polarization
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: June 21, 2013
Manuscript Accepted: June 27, 2013
Published: July 25, 2013

Tao Liu, Jiubin Tan, Jian Liu, and Hongting Wang, "Modulation of a super-Gaussian optical needle with high-NA Fresnel zone plate," Opt. Lett. 38, 2742-2745 (2013)

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Fig. 1. Fig. 2. Fig. 3.

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