Abstract
A circle of planar nanoholes in a dielectric thin film can focus light into a sub-half-wavelength spot. The nanostructure with higher rotational symmetry shows better focusing properties. From finite-difference time-domain calculations, we verified such a focusing spot coming from the constructive interference of diffraction beams near the nanoholes. For a size lens with eight diameter holes, we achieved an optical spot smaller than measured at wavelength. This nanostructure provides a simple way to massively fabricate a planar lens array with a scale down to the submicrometer level.
© 2009 Optical Society of America
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