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Although negative-refractive-index metamaterials have successfully achievedsubwavelength focusing, image resolution is limited by the presence of losses.In this Letter, a metal transmission screen with subwavelength spaced slots isproposed that focuses the near-field beyond the diffraction limit andfurthermore, is easily scaled from microwave frequencies to the optical regime.An analytical model based on the superposition of shifted beam patterns isdeveloped that agrees very well with full-wave simulations and is corroboratedby experimental results at microwave frequencies.

A spatially shifted beam approach to subwavelength focusing