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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13646–13653

Continuous Numerical Aperture Properties of a Cylindrically Polarized Light Illuminated Sub-wavelength Annular Aperture

Chun-Chieh Fang, Tsung-Dar Cheng, Jyi-Tyan Yeh, Kuang-Chong Wu, and Chih-Kung Lee  »View Author Affiliations

Optics Express, Vol. 17, Issue 16, pp. 13646-13653 (2009)

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We investigated the process of focusing a radially polarized (RP) light beam through a sub-wavelength annular aperture (SAA). We found that the result was a non-diffraction doughnut-shaped light beam which propagates in free space. After analyzing the electric field component of the focus generated by the SAA structure, we identified the relationship between the focal field generated by the SAA. We then compared it to a case with a traditional objective lens. From our findings, we propose that a SAA structure can be viewed as a continuous numerical aperture optical element.

© 2009 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.1960) Physical optics : Diffraction theory
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Diffraction and Gratings

Original Manuscript: June 16, 2009
Revised Manuscript: July 9, 2009
Manuscript Accepted: July 10, 2009
Published: July 23, 2009

Chun-Chieh Fang, Tsung-Dar Cheng, Jyi-Tyan Yeh, Kuang-Chong Wu, and Chih-Kung Lee, "Continuous numerical aperture properties of a cylindrically polarized light illuminated sub-wavelength annular aperture," Opt. Express 17, 13646-13653 (2009)

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