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Two-Dimensional Subwavelength Focusing Using a Slotted Meta-Screen

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2 Author(s)
Markley, L. ; Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON ; Eleftheriades, G.V.

A transmission screen with subwavelength slots is described which can focus electromagnetic radiation to a 2-D subwavelength spot. Unlike negative-refractive-index focusing implementations, this ldquometa-screenrdquo does not suffer from image degradation when losses are introduced and is easily scalable from microwave to Terahertz frequencies and beyond. The slotted geometry is designed using a theory of shifted beams to determine the necessary weighting factors for each slot element, which are then converted to appropriate slot dimensions. The screen was designed using a pair of rotated orthogonal focusing axes to produce a spot on a focal plane located 0.25 lambda away. Full-wave simulations are corroborated by experimental measurements at 10 GHz reporting a full-width half-maximum beam width of 0.27 lambda along the x-axis and 0.38 lambda along the z-axis.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 3 )