Evanescent wave multimode optical waveguide and sensor with...

Details Evanescent wave multimode optical waveguide and sensor with... Evanescent wave multimode optical waveguide and sensor with...

G - Physics

01

D

G01D 5/353 (2006.01) G01N 21/77 (2006.01) G02B 6/032 (2006.01)

Patent

CA 2590813

There is provided an evanescent wave multimode optical waveguide sensitive to a chemical species or to a physical parameter. The optical waveguide comprises a core and a cladding having a cladding refractive index lower than that of the core for guiding light to be propagated in the optical waveguide. The cladding defines with the core an optical waveguide providing mode coupling. A chemical indicator is provided in the cladding for causing a variation of the optical absorption of the cladding as a function of the chemical species or the physical parameter. The cladding is interrogated by the evanescent wave of the propagated light. The mode coupling causes unabsorbed light power to be redistributed among the multiple modes while light propagates along the optical waveguide.

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