Waveguide sensor

Details Waveguide sensor Waveguide sensor

G - Physics

01

N

G01N 21/41 (2006.01) G01N 21/43 (2006.01) G02B 6/122 (2006.01) G01N 21/55 (2006.01)

Patent

CA 2101072

2101072 9214177 PCTABS00014 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 indexes of the waveguide body, clad, metal clad segment, and chemical species. Dual or multiple measurement methods use a pair of 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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