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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 12 — Jun. 17, 2013
  • pp: 13949–13957

Near-field beam focusing by a single bare subwavelength metal slit with the high-index transmission space

Yan Guo, Bo Zhao, and Jianjun Yang  »View Author Affiliations

Optics Express, Vol. 21, Issue 12, pp. 13949-13957 (2013)

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We theoretically demonstrate that a single bare subwavelength metal slit without any surrounding corrugations can have a capability to steer the incident light into focusing patterns by introducing a high index in the transmission half-space. The focusing properties are identified to depend on both the slit width and the output permittivity. The underlying physics lies in the interference of quasi-cylindrical waves scattered from the slit, and our proposed model agrees well with the simulation results. This finding is believed to inspire some novel ideas for the nano-optics design.

© 2013 OSA

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(160.3918) Materials : Metamaterials
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Diffraction and Gratings

Original Manuscript: April 2, 2013
Revised Manuscript: May 18, 2013
Manuscript Accepted: May 20, 2013
Published: June 3, 2013

Yan Guo, Bo Zhao, and Jianjun Yang, "Near-field beam focusing by a single bare subwavelength metal slit with the high-index transmission space," Opt. Express 21, 13949-13957 (2013)

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