Optical-waveguide sensor chip, method of manufacturing the same, method of measuring substance, substance-measuring kit and optical-waveguide sensor

1. An optical-waveguide sensor chip, comprising:

a planar optical waveguide configured to generate evanescent light by propagating incident light therein;

a first substance immobilized on the surface of the optical waveguide, and which is specifically reacted with an analyte substance in an analyte sample; and

fine particles dispersed on the optical waveguide and having a second substance immobilized on the surface thereof, the second substance being specifically reacted with the analyte substance in the analyte sample,

wherein the fine particles have a diameter of 760 nm to 10 μm.

2. The optical-waveguide sensor chip according to claim 1 , wherein the optical waveguide is made of glass.

3. The optical-waveguide sensor chip according to claim 1 , wherein the optical waveguide is an organic resin film having a thickness of 3 to 300 μm.

4. The optical-waveguide sensor chip according to claim 1 , wherein the fine particles are resin beads.

5. The optical-waveguide sensor chip according to claim 1 , wherein the fine particles are metal colloids.

6. The optical-waveguide sensor chip according to claim 1 , wherein the analyte substance in the analyte sample is an antigen and each of the first and second substances, which is specifically reactive with the analyte substance, is antibodies.

7. The optical-waveguide sensor chip according to claim 1 , further comprising a blocking layer formed on the optical waveguide, the fine particles being dispersed on the surface of the blocking layer.

8. The optical-waveguide sensor chip according to claim 7 , wherein the blocking layer comprises a water-soluble substance.

9. The optical-waveguide sensor chip according to claim 1 , wherein the fine particles are at least partly dispersed on an area in which the evanescent light is emitted from the optical waveguide.