Super-focusing of visible and UV light using a meta surface

In this paper, a novel meta surface is proposed for super-focusing. This surface contains two slits surrounded by finite corrugations for enhanced focusing. This simple surface has the super-focusing ability to focus both near and far field light in a hot-spot with an FWHM much smaller than half the wavelength of the incident light. The structure is suitable for one dimensional and two dimensional focusing applications. The enhanced transmission through the double slit is also utilized for directional beaming over a wide cone of angles. Moreover, various structures have been proposed for super-focusing in the visible and ultraviolet wavelengths. The proposed structure lends itself to various applications, including subwavelength imaging and nanolithography. (paper)