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Method and apparatus for labeling using diffraction grating-based encoded optical identification elements

  • US 7,126,755 B2
  • Filed: 09/12/2003
  • Issued: 10/24/2006
  • Est. Priority Date: 09/12/2002
  • Status: Expired due to Term
First Claim
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1. An optical identification element for identifying an item, comprising:

  • a substrate, at least a portion of said substrate being made of a substantially single material and having at least one diffraction grating embedded therein, said grating having a resultant refractive variation within the substantially single material at a grating location;

    said grating providing an output optical signal indicative of a code when illuminated by an incident light signal propagating from outside the substrate, said output signal being a result of passive, non-resonant scattering from said grating when illuminated by said incident light signal; and

    the element being at least partially disposed on the item.

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