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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 15 — Jul. 20, 2009
  • pp: 12351–12361

Plasmonic meta-screen for alleviating the trade-offs in the near-field optics

Yan Wang, Alex M. H. Wong, Loïc Markley, Amr S. Helmy, and George V. Eleftheriades  »View Author Affiliations

Optics Express, Vol. 17, Issue 15, pp. 12351-12361 (2009)

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We propose a “meta-screen” design, consisting of a metallic sheet patterned with a dense array of nano-sized slot antennas, for inducing sub-wavelength optical spots in the near-field. Compared to other transmission screen topologies, our design overcomes the trade-off of low throughput versus resolution of a sub-wavelength aperture by inducing resonance in the slots. In addition, the antenna array serves to effectively narrow the spot size through the superposition of spatially shifted beams produced by each slot element. Such a design offers a practical approach for extending the near-field sensing/imaging distance at optical frequencies. The effectiveness of narrowing the spot size through the array topology is demonstrated by evaluating the full-width-half-maximum (FWHM) beamwidth at a distance of 0.1λ0 away from the screen. We show that an array with just three elements improves the beamwidth by more than 30% compared to a single resonant slot element. In this paper, important issues such as the operating principle and the design process of the meta-screen, the characteristics of plasmonic slot antenna, the impact of the number of array elements, and the effect of asymmetry due to the presence of a supporting substrate are discussed.

© 2009 OSA

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(180.4243) Microscopy : Near-field microscopy
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Diffraction and Gratings

Original Manuscript: May 22, 2009
Revised Manuscript: June 26, 2009
Manuscript Accepted: June 28, 2009
Published: July 6, 2009

Yan Wang, Alex M. H. Wong, Loïc Markley, Amr S. Helmy, and George V. Eleftheriades, "Plasmonic meta-screen for alleviating the trade-offs in the near-field optics," Opt. Express 17, 12351-12361 (2009)

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