OPTICAL IDENTIFICATION ELEMENT HAVING A NON-WAVEGUIDE SUBSTRATE
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Abstract
An optical identification element including a non-waveguide optical substrate. The optical substrate has a volume and includes an inner region surrounded by an outer region. The inner region has an index of refraction that prevents the optical substrate from forming an optical waveguide. The optical substrate includes a diffraction grating within the volume, and the grating provides an output signal indicative of a code when illuminated by an incident light.
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Citations
48 Claims
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1-28. -28. (canceled)
- 29. 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 forming an optical waveguide and 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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39. A method for reading an optical identification element comprising:
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obtaining an optical identification element that includes a non-waveguide optical substrate having a volume and an inner region surrounded by an outer region, the inner region having an index of refraction that prevents the optical substrate from forming an optical waveguide and the optical substrate including a diffraction grating within the volume; illuminating the grating with an incident light, the grating providing an output signal indicative of a code; and reading the output signal. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification