| 摘要 |
An optical sensor head detects only the refractive index inside a through hole and is not susceptible to influence from the outside of the through hole. An optical sensor head includes a light emitting device 2 in which a first reflection surface 4, a second reflection surface 5 that opposes the first reflection surface 4 and a waveguide 6 provided between the first reflection surface 4 and the second reflection surface 5 are formed; a light blocking film 7 in which a through hole 8 for generating near-field light is provided, and that is formed on the first reflection surface 4; and a detector 3 that detects the light intensity of light emitted from the light emitting device 2 through the second reflecting surface 5. The opening area of the through hole 8 on the emission surface 7b of the light of the light blocking film 7 is larger than the opening area of the through hole 8 on the opposing surface 7a of the light blocking film 7 opposing the first reflection surface 4. |
