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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 4 — Feb. 16, 2009
  • pp: 2707–2713

Effect of subwavelength annular aperture diameter on the nondiffracting region of generated Bessel beams

Yuh-Yan Yu, Ding-Zheng Lin, Long-Sun Huang, and Chih-Kung Lee  »View Author Affiliations


Optics Express, Vol. 17, Issue 4, pp. 2707-2713 (2009)
http://dx.doi.org/10.1364/OE.17.002707


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Abstract

A subwavelength annular aperture (SAA) made on metallic film and deposited on a glass substrate was fabricated by electron-beam lithography (EBL) and which was followed by a metal lift-off process to generate a long propagation range Bessel beam. We propose tuning the focal length and depth of focus (DOF) by changing the diameter of the SAA. We used finite-difference time domain (FDTD) simulations to verify our experimental data. We found that the position of the Bessel Beam focus spot (i.e. focal length) will be farther away from the SAA plane as the diameter of the SAA increases. In addition, the depth of focus (DOF) which is the length of the Bessel beam non-diffracting area, also increases as the diameter of the SAA expands.

© 2009 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(240.6680) Optics at surfaces : Surface plasmons
(220.4241) Optical design and fabrication : Nanostructure fabrication
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: December 10, 2008
Revised Manuscript: January 29, 2009
Manuscript Accepted: February 4, 2009
Published: February 10, 2009

Citation
Yuh-Yan Yu, Ding-Zheng Lin, Long-Sun Huang, and Chih-Kung Lee, "Effect of subwavelength annular aperture diameter on the nondiffracting region of generated Bessel beams," Opt. Express 17, 2707-2713 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-4-2707


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