Patent ID: 8541742

Claim:
A bolometer-type THz wave detector having a thermal isolation structure in which a temperature detecting portion including a bolometer thin film that is connected to electrical wirings is supported in a state of being raised from a substrate by a supporting portion including the electrical wirings to be connected to a Read-out integrated circuit formed in the substrate, characterized in that: the wave detector comprising a reflective film for reflecting THz waves that is formed in such a position as to be opposed to the temperature detecting portion on the substrate, an absorbing film for absorbing the THz waves that is formed on the front surface or the back surface of the temperature detecting portion or at an inner position in the temperature detecting portion, whereby an optical resonant structure formed by the reflective film and the temperature detecting portion, and a film of dielectric transparent to the THz waves that is formed on the reflective film, wherein the film thickness of the dielectric is set so that the distance between an upper surface of the dielectric film and a lower surface of the temperature detecting portion is smaller than 8 μm.