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Optical identification element having a non-waveguide substrate

  • US 7,791,802 B2
  • Filed: 06/23/2008
  • Issued: 09/07/2010
  • Est. Priority Date: 02/19/2004
  • Status: Active Grant
First Claim
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1. An optical identification element comprising a non-waveguide optical substrate having a volume and including an inner region surrounded by an outer region, the inner region having an index of refraction that prevents the optical substrate from guiding light in a propagation mode, the optical substrate including a diffraction grating within the volume, the grating providing an output signal indicative of a code when illuminated by an incident light.

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