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RADIATION DEVICE OR SIGNAL

  • US 20100155609A1
  • Filed: 09/11/2007
  • Published: 06/24/2010
  • Est. Priority Date: 09/11/2006
  • Status: Abandoned Application
First Claim
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1. A zoned radiation device for converging radiation of a wavelength λ

  • to a focus at distance b, the device comprising a first set of zones and a second set of zones, wherein the first set of zones have a different characteristic to the second set and wherein the area of the zones decrease as their distance from a predetermined point increases, and one or more zone distances at which a zone of the first set with a first characteristic switches to a second zone with a second characteristic are configured such that the device can focus the radiation with wavelength λ

    at a distance b with an autocorrelation/point spread function that is sharper than the autocorrelation/point spread function produced by zones configured to a Fresnel zone construction.

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