Patent ID: 8648302

Claim:
A thermal detector comprising: a substrate; a support member supported on the substrate so that a cavity is formed between the substrate and the support member; a heat-detecting element formed on the support member; a first light-absorbing layer contacting the heat-detecting element and formed on the heat-detecting element and the support member; and a second light-absorbing layer contacting the first light-absorbing layer and formed on the first light-absorbing layer, the second light-absorbing layer having a higher refractive index than that of the first light-absorbing layer, the support member, the first light-absorbing layer and the second light-absorbing layer being arranged such that a first wavelength resonates between a surface of the support member and an upper surface of the second light-absorbing layer, and a second wavelength, which is different from the first wavelength, resonates between an interface, at which the first light-absorbing layer and the second light-absorbing layer are in contact with each other, and the upper surface of the second light-absorbing layer.