article
Holography-Inspired Screens for Sub-Wavelength Focusing in the Near Field
George V. Eleftheriadesa b, Alex M. H. Wonga b
- aDepartment of Electrical and Computer Engineering, Toronto, ONT, Canada
- bUniversity of Toronto, (Toronto)
IEEE Microwave and Wireless Components LettersIEEE Microwave Theory and Techniques Society2008-04-01 57 citations8 references
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Abstract
Inspired by the principle of holography we present a concept for making simple transmission screens that can focus an incident wave into a sub-wavelength spot in the near field. The screen is made out of closely spaced, unequal slits cut on a metallic sheet. Fullwave simulations are presented for an example screen that focuses an incident plane wave down to a spot having a peak-to-null beamwidth equal to lambda/10 .