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A transmission screen with subwavelength slots is described which can focuselectromagnetic radiation to a two-dimensional subwavelength spot. Unlikenegative-refractive-index focusing implementations, this "meta-screen" does notsuffer from image degradation when losses are introduced and is easily scalablefrom microwave to Terahertz frequencies and beyond. The slotted geometry isdesigned using a theory of shifted beams to determine the necessary weightingfactors for each slot element, which are then converted to appropriate slotdimensions. The screen was designed using a pair of rotated orthogonal focusingaxes to produce a spot on a focal plane located 0.25 \lambda away. Full-wavesimulations are corroborated by experimental measurements at 10 GHz reporting afull-width half-maximum beam width of 0.27 \lambda along the x-axis and 0.38\lambda along the z-axis.

Two-dimensional subwavelength focusing using a slotted meta-screen