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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 18 — Sep. 4, 2006
  • pp: 8037–8042

Periodic dielectric bars assisted enhanced transmission and directional light emission from a single subwavelength slit

Zu-Bin Li, Jian-Guo Tian, Wen-Yuan Zhou, Wei-Ping Zang, and Chunping Zhang  »View Author Affiliations

Optics Express, Vol. 14, Issue 18, pp. 8037-8042 (2006)

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The transmission from a single subwavelength slit in a metal film with periodic dielectric bars on its surfaces has been analyzed numerically by the finite-difference time-domain method. Results show that the role of the periodic dielectric bars is just the same as that of the periodic grooves directly on the surfaces. With the modulations of dielectric bars on the input and output surfaces of the metal film, light transmission through the subwavelength slit is enhanced extraordinarily and confined to directional emission. The CDEW model is employed to explain the mechanism of the transmission enhancement and directional emission caused by the periodic dielectric bars.

© 2006 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1940) Diffraction and gratings : Diffraction
(240.6690) Optics at surfaces : Surface waves

ToC Category:
Diffraction and Gratings

Original Manuscript: May 15, 2006
Revised Manuscript: June 26, 2006
Manuscript Accepted: July 21, 2006
Published: September 1, 2006

Zu-Bin Li, Jian-Guo Tian, Wen-Yuan Zhou, Wei-Ping Zang, and Chunping Zhang, "Periodic dielectric bars assisted enhanced transmission and directional light emission from a single subwavelength slit," Opt. Express 14, 8037-8042 (2006)

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