Composition including an item and an encoded optical substrate and a method for identifying an item
First Claim
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1. A method of identifying a dispersive substance, comprising:
- (a) providing an item comprising the dispersive substance and an optical substrate removably attached to the dispersive substance, at least a portion of the optical substrate having a diffraction grating embedded therein or thereon, the diffraction grating having a resultant refractive index variation at a grating location indicative of a code;
(b) removing the optical substrate from the dispersive substance;
(c) illuminating the optical substrate with incident light after the removing, the diffraction grating providing an output light signal indicative of the code;
(d) reading the output light signal from the optical substrate after the optical substrate is removed from the dispersive substance, thereby detecting the code therefrom; and
(e) identifying the dispersive substance from the detected code.
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Abstract
A composition including an optical substrate removably attached to an item. At least a portion of the substrate has a diffraction grating embedded therein or thereon. The grating has a resultant refractive index variation at a grating location. The grating provides an output optical signal indicative of a code when illuminated by an incident light signal.
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Citations
24 Claims
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1. A method of identifying a dispersive substance, comprising:
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(a) providing an item comprising the dispersive substance and an optical substrate removably attached to the dispersive substance, at least a portion of the optical substrate having a diffraction grating embedded therein or thereon, the diffraction grating having a resultant refractive index variation at a grating location indicative of a code; (b) removing the optical substrate from the dispersive substance; (c) illuminating the optical substrate with incident light after the removing, the diffraction grating providing an output light signal indicative of the code; (d) reading the output light signal from the optical substrate after the optical substrate is removed from the dispersive substance, thereby detecting the code therefrom; and (e) identifying the dispersive substance from the detected code. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification