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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 14 — Jul. 5, 2010
  • pp: 14788–14793

Visible light focusing demonstrated by plasmonic lenses based on nano-slits in an aluminum film

Qin Chen and David R. S. Cumming  »View Author Affiliations


Optics Express, Vol. 18, Issue 14, pp. 14788-14793 (2010)
http://dx.doi.org/10.1364/OE.18.014788


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Abstract

We experimentally demonstrate plasmonic lenses working in the visible range with well controlled focal lengths using nano-slits in an aluminum film. The fabricated lenses were characterized using confocal scanning optical microscopy. Two lenses with a design focal length 3 µm and 6 µm at 633 nm were investigated in detail. The full-width half-maximum beam width at the focal point was found to be 470 nm and 490 nm, and the extension of the light spot was 1.3 μm and 2.3 μm respectively. Lens performance compared extremely well with the expected behaviour from finite-difference time-domain modeling. The focal length from experiment and simulation agreed to within 3.5%. The lens manufacture was found to be insensitive to deviations from the optimum process parameters indicating that lens components can be reliably designed and produced.

© 2010 OSA

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(240.6680) Optics at surfaces : Surface plasmons
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optics at Surfaces

History
Original Manuscript: May 13, 2010
Revised Manuscript: June 18, 2010
Manuscript Accepted: June 18, 2010
Published: June 25, 2010

Citation
Qin Chen and David R. S. Cumming, "Visible light focusing demonstrated by plasmonic lenses based on nano-slits in an aluminum film," Opt. Express 18, 14788-14793 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-14-14788


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