| US 7,567,734 B2 | ||
| Ridge waveguide optical sensor incorporating a Bragg grating | ||
| Xiaoli Dai, Ottawa (Canada); Stephen J. Mihailov, Kanata (Canada); Robert B. Walker, Spencerville (Canada); Chantal Blanchetiere, Ottawa (Canada); Claire Callender, Nepean (Canada); Huimin Ding, Nepean (Canada); Ping Lu, Ottawa (Canada); Dan Grobnic, Ottawa (Canada); Christopher W. Smelser, Ottawa (Canada); and Gino Cuglietta, Kanata (Canada) | ||
| Assigned to Her Majesty the Queen in right of Canada, as represented by the Minister of Industry, through the Communications Research Centre Canada, Ottawa, Ontario (Canada) | ||
| Filed on Aug. 08, 2008, as Appl. No. 12/222,392. | ||
| Claims priority of provisional application 60/954854, filed on Aug. 09, 2007. | ||
| Prior Publication US 2009/0041405 A1, Feb. 12, 2009 | ||
| Int. Cl. G02B 6/00 (2006.01); G02B 6/26 (2006.01) | ||
| U.S. Cl. 385—12 [385/10; 385/30; 385/32] | 23 Claims |
| 1. An optical sensor for sensing information relating to an analyte liquid or gas, comprising:
a planar substrate having a refractive index nc;
a ridge waveguide having at least a region thereof unclad and having a refractive index nr wherein said ridge waveguide is formed upon and supported by substrate, and wherein the substrate serves as cladding layer
for the ridge waveguide at a location where the ridge waveguide contacts the substrate; and,
a Bragg grating having at least two resonance modes for providing information relating to both temperature and refractive
index of the surrounding analyte liquid or gas, wherein a first resonance mode has a different response to the analyte when
compared to a second resonance mode, while both modes have a same reaction to temperature, wherein said Bragg grating is formed
within the unclad region of ridge waveguide, wherein nc.<nr.
|