Planar and other waveguide refractive index sensors using metal

Details Planar and other waveguide refractive index sensors using metal Planar and other waveguide refractive index sensors using metal

1991-01-24

1992-11-17

Lee, John D.

Optical waveguides

Planar optical waveguide

385123, 385141, 385 12, 356128, G02B 602

Patent

active

051650053

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.

REFERENCES:
patent: 4929049 (1990-05-01), LeGoullon et al.
patent: 5026139 (1991-06-01), Klainer et al.

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