H - Electricity – 01 – P
Patent
H - Electricity
01
P
H01P 3/20 (2006.01) G02B 5/00 (2006.01) G02B 27/00 (2006.01) G02B 5/32 (2006.01)
Patent
CA 2645794
A method and apparatus for near-field focusing of an incident wave, over a range of frequencies from microwaves to optical frequencies, into a sub-wavelength spot having a peak-to-null beamwidth of .lambda./10. The screen may be made out of closely spaced, unequal slots cut on a metallic sheet. Nano-scale focusing capability may be achieved with a simple structure of three slots on a metallic sheet, which can be readily implemented using current nanofabrication technologies. Unlike negative-refractive-index focusing implementations, this "meta-screen" 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 clement, which are then converted to appropriate slot dimensions.
Miller Thomson Llp
The University Of Toronto Governing Council
LandOfFree
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