Journal article
Planar focusing elements using spatially varying near-resonant aperture arrays
XM Goh, L Lin, A Roberts
Optics Express | Published : 2010
DOI: 10.1364/OE.18.011683
Abstract
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. © 2010 Optical Society of America.
Grants
Awarded by Australian Research Council
Funding Acknowledgements
This research was supported under Australian Research Council's Discovery Projects funding scheme (project number DP0878268). The authors also thank Dr. Kumaravelu Ganesan and Dr. David Simpson of The University of Melbourne for assistance with the electron beam deposition and for the use of the confocal microscope.