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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5330–5339

Propagation characteristics of silver and tungsten subwavelength annular aperture generated sub-micron non-diffraction beams

Tsung-Dar Cheng, Ding-Zheng Lin, Jyi-Tyan Yeh, Jonq-Min Liu, Chau-Shioung Yeh, and Chih-Kung Lee  »View Author Affiliations

Optics Express, Vol. 17, Issue 7, pp. 5330-5339 (2009)

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We examined the optical properties such as propagation modes, focal length, side lobes, etc. of metallic subwavelength annular apertures (SAA) and used finite-difference time-domain (FDTD) simulation to compare our experimental findings. Using two different metals, silver and tungsten, we examined the different optical transmission properties of the two metallic SAA structures. The far-field propagation of the silver SAA structure was found to be a type of quasi-Bessel beam when compared with a quasi-Bessel beam generated by a perfect axicon. The propagation characteristics of these two beams were found to match qualitatively. The far-field transmitted light generated by the silver SAA structure was found to possess a 390nm sub-micron focal spot with a 24μm depth of focus, which was much smaller than the focal spot generated by a perfect axicon. We also found that a silver SAA structure can generate a sub-micron quasi-Bessel beam that has a much lower far-field side-lobe when compared to that of non-diffraction beams generated by a tungsten SAA structure.

© 2009 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: January 30, 2009
Revised Manuscript: March 14, 2009
Manuscript Accepted: March 16, 2009
Published: March 19, 2009

Tsung-Dar Cheng, Ding-Zheng Lin, Jyi-Tyan Yeh, Jonq-Min Liu, Chau-Shioung Yeh, and Chih-Kung Lee, "Propagation characteristics of silver and tungsten subwavelength annular aperture generated sub-micron non-diffraction beams," Opt. Express 17, 5330-5339 (2009)

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