Open AccessPlanar focusing elements using spatially varying near-resonant aperture arrays
Author(s) -
Xiao Ming Goh,
Lin Liu,
Ann Roberts
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.011683
Subject(s) - optics , planar , wavelength , aperture (computer memory) , phase (matter) , physics , finite element method , materials science , acoustics , computer graphics (images) , quantum mechanics , computer science , thermodynamics
Resonances in subwavelength apertures are accompanied by wavelength-dependent phase shifts in the transmitted fields offering a potential for manipulation of wavefields. Here, we present Finite Element Method simulations and experiments investigating light passing through arrays of nanometric spatially varying near-resonant slits perforated in a silver film. We demonstrate that a one-dimensional focusing element can be obtained by tailoring the phase across the device through varying slit sizes around the resonant dimensions for a particular design wavelength.