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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 7 — Mar. 1, 2012
  • pp: 994–999

Circular Dammann grating under high numerical aperture focusing

Junjie Yu, Changhe Zhou, Wei Jia, Anduo Hu, Shaoqing Wang, and Jianyong Ma  »View Author Affiliations

Applied Optics, Vol. 51, Issue 7, pp. 994-999 (2012)

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Circular Dammann grating (CDG) under high numerical aperture (NA) focusing is described based on Richards–Wolf vectorial diffraction theory in this paper. Several CDGs are presented under the condition of NA=0.9 with the illumination of circularly polarized plane-wave laser beams. Numerical results show that the sizes of these circular patterns with equal-intensity are in the wavelength scale, and doughnut-shaped central spots and dark rings are in the subwavelength width. To verify this kind of CDG, a binary pure-phase three-order CDG is fabricated to produce a dark center pattern surrounded by three concentric bright rings. The corresponding intensity distribution of the pattern on the focal plane of a high-NA objective (NA=0.9) is measured, and the results agree well with theoretical simulations. This kind of CDG with annular patterns of equal-intensity in the wavelength scale should be highly interesting for its potential applications in optical trapping, stimulated emission depletion (STED) microscopy, and the study of singular optics, as well as annular array illumination.

© 2012 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(230.1360) Optical devices : Beam splitters

ToC Category:
Diffraction and Gratings

Original Manuscript: September 7, 2011
Manuscript Accepted: December 14, 2011
Published: March 1, 2012

Junjie Yu, Changhe Zhou, Wei Jia, Anduo Hu, Shaoqing Wang, and Jianyong Ma, "Circular Dammann grating under high numerical aperture focusing," Appl. Opt. 51, 994-999 (2012)

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