Planar focusing elements using spatially varying near-resonant aperture arrays.
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.
Goh
X M
XM
School of Physics, The University of Melbourne, Victoria 3010, Australia. xgoh1@pgrad.unimelb.edu.au
Lin
L
L
Roberts
A
A
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D007909:Lenses; D008027:Light; D036103:Nanotechnology / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D014159:Transducers; D014732:Vibration