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Proceedings Paper

Spatially varying near-resonant aperture arrays for beam manipulation
Author(s): X. M. Goh; L. Lin; A. Roberts
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Paper Abstract

Enhanced transmission has been associated with surface wave excitation and aperture arrangement on a metallic film. Aperture resonances, however, have been demonstrated to exist without an order in the arrangement of apertures, with properties dependent on geometry and optical properties of the aperture filling. These resonances are accompanied by wavelength-dependent phase shifts in the transmitted fields offering the potential for manipulation of wavefields. Here, we present Finite Element Method simulations investigating light passing through periodic arrays of nanometric spatially varying near-resonant slits perforated in a metallic film. We show that a tailored phase modulation can be introduced into an incident optical wavefield by varying aperture sizes around the resonant dimensions for a particular design wavelength, permitting control of wavefields which can be employed for beam deflection, beam focusing or for producing a wavelength-specific spatial field change.

Paper Details

Date Published: 2 September 2009
PDF: 8 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 739427 (2 September 2009); doi: 10.1117/12.824539
Show Author Affiliations
X. M. Goh, The Univ. of Melbourne (Australia)
L. Lin, The Univ. of Melbourne (Australia)
A. Roberts, The Univ. of Melbourne (Australia)

Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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