Photonic crystal and waveguide sensor device

A sensor device for detecting a substance contained in a fluid comprising:

• a first photonic crystal region;
• a second photonic crystal region;
• a first channel which is connected to the first photonic crystal region, and passes the fluid containing the substance therein;
• a second channel which is connected to the second photonic crystal region, and passes a fluid for reference therein;
• an optical waveguide which is connected to the first photonic crystal region and the second photonic crystal region, and guides light;
• and
• a detecting section for detecting a difference between a light which has passed through the optical waveguide and the first photonic crystal region and a light which has passed through the optical waveguide and the second photonic crystal region,
• wherein the optical waveguide includes a first optical waveguide and a second optical waveguide for guiding light respectively to the first photonic crystal region and the second photonic crystal region, and wherein the first optical waveguide has a phase-modulating element installed therein.