Diffraction grating-based encoded particle
First Claim
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1. An encoded particle, comprising:
- a particle 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 index variation within said single material at a grating location, said refractive index variation comprising a plurality of refractive index pitches superimposed at said grating location; and
said grating providing an output optical signal indicative of a code when illuminated by an incident light signal propagating from outside said substrate, said output optical signal being a result of passive, non-resonant scattering from said grating when illuminated by said incident light signal.
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Abstract
An encoded particle 8 includes a particle substrate 10; at least a portion of the substrate having at least one diffraction grating disposed therein, the grating having a resultant refractive index variation at a grating location, the grating being embedded within a substantially single material of the substrate; and the grating providing an output optical signal indicative of a code when illuminated by an incident light signal propagating in free space, the output optical signal being a result of passive, non-resonant scattering from the grating when illuminated by the incident light signal.
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Citations
70 Claims
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1. An encoded particle, comprising:
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a particle 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 index variation within said single material at a grating location, said refractive index variation comprising a plurality of refractive index pitches superimposed at said grating location; and said grating providing an output optical signal indicative of a code when illuminated by an incident light signal propagating from outside said substrate, said output optical signal being a result of passive, non-resonant scattering from said grating when illuminated by said incident light signal. - 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, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A method of reading an encoded particle, comprising:
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obtaining 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 index variation within said single material at a grating location, said refractive index variation comprising a plurality of refractive index pitches superimposed at said grating location; illuminating said substrate with an incident light signal propagating from outside said substrate, said substrate providing an output optical signal indicative of a code, said output optical signal being a result of passive, non-resonant scattering from said grating when illuminated by said incident light signal; and reading said output optical signal and detecting said code therefrom. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification