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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 20 — Sep. 28, 2009
  • pp: 17801–17811

Near-field focusing with optical phase antennas

A. G. Curto, A. Manjavacas, and F. J. García de Abajo  »View Author Affiliations

Optics Express, Vol. 17, Issue 20, pp. 17801-17811 (2009)

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We investigate the near-field focusing properties of three-dimensional phase antennas consisting of concentric rings designed to have source and image spots separated by several microns from the lens. Tight focal spots are obtained for silicon or gold rings patterned in a silica matrix. We analyze in detail the dependence of the performance of these lenses on geometrical parameters such as the number of rings, the ring thickness, and the focal distance. Subwavelength focal spots are found to form at distances of tens of wavelengths from the lens, thus suggesting applications to remote sensing and penlight microscopy and lithography.

© 2009 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(290.5870) Scattering : Scattering, Rayleigh

ToC Category:

Original Manuscript: July 30, 2009
Manuscript Accepted: August 30, 2009
Published: September 18, 2009

A. G. Curto, A. Manjavacas, and F. J. García de Abajo, "Near-field focusing with optical phase antennas," Opt. Express 17, 17801-17811 (2009)

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