| 摘要 |
Provided is a gas detection apparatus comprising an optical waveguide, wherein the optical waveguide comprises: a core formed on a substrate, the core having a refraction index of n1; and a clad to cover an upper part of the core, the clad having a refraction index of n2, wherein at least one side of a cross-sectional surface of the core, perpendicular to a light propagation direction, is formed by a straight line, and wherein the clad is formed from a sensitive resin which makes a magnitude relation of the refraction index of the core and the refraction index of the clad satisfy n1<=n2 in an atmosphere where a density of a detection gas is less than a predetermined density, and which makes the magnitude relation satisfy n1>n2 in an atmosphere where the density of the detection gas is not less than the predetermined density.
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