Optically encoded particles through porosity variation
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United States of America Patent
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Nov 10, 2015
Grant Date -
Jun 28, 2007
app pub date -
Dec 21, 2004
filing date -
Feb 7, 2002
priority date (Note) -
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Abstract
The invention concerns a particle having a code from a library of codes embedded in its physical structure by refractive index changes between different regions of the particle. In preferred embodiments, a thin film possesses porosity that varies in a manner to produce a code detectable in the reflectivity spectrum. An assay detection method uses such a particle and detects a spectral shift in the presence of an analyte. Additional embodiments are disclosed including additional features.
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