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Proceedings Paper

Wavelength-tunable focal length of a nanopatterned metallic planar lens with strong focusing capability
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Paper Abstract

Numerical results for the spatial distributions of the light transmitted through metallic planar lenses composed of symmetric nanogroove arrays on the surfaces of a gold film deposited on a dielectric substrate are presented and explained. Both the near and far-field distributions of the intensity of light transmitted through such films, which are modeled by two aligned and reversed one-dimensional surface profile functions, are calculated by the use of a Green's function formalism. The focusing action obtained for different groove-width variations is investigated thoroughly. Results for an optimal transverse focus based on a quadratic variation of groove width across the array are also obtained, in addition to the effect of groove shape on the sharpness of planar lens focusing. Meanwhile, a significant dependence of the focal length on the wavelength of light incident from the air side through the gold film into a dielectric substrate is found for this detector configuration.

Paper Details

Date Published: 2 September 2010
PDF: 6 pages
Proc. SPIE 7792, Reflection, Scattering, and Diffraction from Surfaces II, 77920S (2 September 2010); doi: 10.1117/12.861497
Show Author Affiliations
L. David Wellems, Air Force Research Lab. (United States)
Danhong Huang, Air Force Research Lab. (United States)
T. A. Leskova, Univ. of California, Irvine (United States)
A. A. Maradudin, Univ. of California, Irvine (United States)

Published in SPIE Proceedings Vol. 7792:
Reflection, Scattering, and Diffraction from Surfaces II
Zu-Han Gu; Leonard M. Hanssen, Editor(s)

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