Chemical synthesis using diffraction grating-based encoded optical elements
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United States of America Patent
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Mar 13, 2007
Grant Date -
Jul 8, 2004
app pub date -
Sep 12, 2003
filing date -
Sep 12, 2002
priority date (Note) -
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Abstract
An optical identification element having a synthesized chemical attached thereto includes an optical substrate having at least one diffraction grating disposed therein, the grating having a resultant refractive variation at a grating location, said grating being embedded within a substantially single material of said optical substrate; the grating providing an output optical signal indicative of a code when illuminated by an incident light signal propagating in free space, the code identifying at least one of the element and the chemical, the output signal not being a result of laser action with the grating when illuminated by said incident light signal; and the synthesized chemical being attached to the substrate.
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