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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 34, Iss. 12 — Jun. 15, 2009
  • pp: 1867–1869

Focusing subwavelength light by using nanoholes in a transparent thin film

Pei-Kuen Wei, Wei-Lun Chang, Kunag-Li Lee, and En-Hong Lin  »View Author Affiliations


Optics Letters, Vol. 34, Issue 12, pp. 1867-1869 (2009)
http://dx.doi.org/10.1364/OL.34.001867


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Abstract

A circle of planar nanoholes in a dielectric thin film can focus light into a sub-half-wavelength spot. The nanostructure with higher rotational symmetry shows better focusing properties. From finite-difference time-domain calculations, we verified such a focusing spot coming from the constructive interference of diffraction beams near the nanoholes. For a 1 μ m size lens with eight 200 nm diameter holes, we achieved an optical spot smaller than 250 nm measured at 650 nm wavelength. This nanostructure provides a simple way to massively fabricate a planar lens array with a scale down to the submicrometer level.

© 2009 Optical Society of America

OCIS Codes
(050.1965) Diffraction and gratings : Diffractive lenses
(180.4243) Microscopy : Near-field microscopy
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: February 6, 2009
Revised Manuscript: April 24, 2009
Manuscript Accepted: May 8, 2009
Published: June 11, 2009

Citation
Pei-Kuen Wei, Wei-Lun Chang, Kunag-Li Lee, and En-Hong Lin, "Focusing subwavelength light by using nanoholes in a transparent thin film," Opt. Lett. 34, 1867-1869 (2009)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-12-1867


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