Planar and other waveguide refractive index sensors using metal cladding
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United States of America Patent
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Nov 17, 1992
Issued Date -
N/A
app pub date -
Jan 24, 1991
filing date -
Jan 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A species-specific metal clad segment on a waveguide, including a planar waveguide, allows controlled light leakage of light propagating through the waveguide by total internal reflection, to measure refractive index and identify chemical species. A waveguide sensor is designed for a particular chemical species by selecting a metal clad with an affinity for the species and by matching the refractive indices of the waveguide body, clad, metal clad segment and chemical species. Dual or multiple measurement methods use a pair or multiple metal clad segments of different specificity. The metal clad segment may include another material to provide a suitable refractive index while having the desired affinity for the chemical species or to provide a catalyst to react the species to form a reaction product which is more readily detected.
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