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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 10 — May. 9, 2011
  • pp: 9434–9444

Effect of lens size on the focusing performance of plasmonic lenses and suggestions for the design

Yiting Yu and Hans Zappe  »View Author Affiliations


Optics Express, Vol. 19, Issue 10, pp. 9434-9444 (2011)
http://dx.doi.org/10.1364/OE.19.009434


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Abstract

We present a detailed investigation of the effect of lens size on the focusing performance of plasmonic lenses based on metallic nanoslit arrays with variable widths. The performance parameters considered include the focal length, depth of focus (DOF), full-width half-maximum (FWHM) and the maximum intensity of the focal point. 2D FDTD simulation was utilized. The results show that all the lens parameters are greatly affected by the lens size. A larger lens size, with a total phase difference of at least 2π, will produce a better focusing behavior and a closer agreement with the design. The Fresnel number and diffraction theory can be used to explain the effect of lens size. Suggestions are provided for realization of a practical plasmonic lens using the existing nanofabrication techniques.

© 2011 OSA

OCIS Codes
(220.3630) Optical design and fabrication : Lenses
(240.6680) Optics at surfaces : Surface plasmons
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 27, 2011
Revised Manuscript: March 23, 2011
Manuscript Accepted: April 22, 2011
Published: April 29, 2011

Citation
Yiting Yu and Hans Zappe, "Effect of lens size on the focusing performance of plasmonic lenses and suggestions for the design," Opt. Express 19, 9434-9444 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-10-9434


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