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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 5 — Mar. 5, 2007
  • pp: 2585–2591

Directional light beaming control by a subwavelength asymmetric surface structure

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

Optics Express, Vol. 15, Issue 5, pp. 2585-2591 (2007)

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We propose a direct experimental set-up to observe the directional beaming effect of surface plasmon. A single diffracted beam from an asymmetric-sided surface corrugation is demonstrated. A single subwavelength slit with an asymmetric structure was fabricated using a focused ion beam (FIB) onto a metal surface with a glass substrate. By means of surface plasmon (SP) diffraction, the directionality of the light can be changed by the period of the metallic gratings. We show corresponding numerical simulations achieved by a Rigorous Coupled-Wave Analysis (RCWA) method and a Finite-Difference Time-Domain (FDTD) method. The simulation results were in agreement with the experimental data.

© 2007 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: January 10, 2007
Revised Manuscript: February 16, 2007
Manuscript Accepted: February 16, 2007
Published: March 5, 2007

Ding-Zheng Lin, Tsung-Dar Cheng, Chin-Kai Chang, Ji-Tian Yeh, Jonq-Min Liu, Chau-Shioung Yeh, and Chih-Kung Lee, "Directional light beaming control by a subwavelength asymmetric surface structure," Opt. Express 15, 2585-2591 (2007)

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