Terahertz microbolometer based on metamaterial absorber and preparation method of terahertz microbolometer

The invention discloses a terahertz microbolometer based on a metamaterial and a preparation method of the terahertz microbolometer. The terahertz microbolometer is composed of two parts including a metamaterial terahertz absorber and a thermal detector, wherein the thermal detector comprises four layers of materials, namely a microbridge supporting layer, a thermistor film, a metal electrode and a passivation layer. The metamaterial terahertz absorber comprises three layers of materials, namely a bottom-layer metal film, an intermediate medium layer and a top-layer metal film. According to the terahertz microbolometer, the metamaterial terahertz absorber and the thermal detector are integrated, heat generated by the metamaterial absorbing terahertz radiation is transmitted to the thermal detector, and then, the electrical property of the thermistor film is changed, so that the terahertz room-temperature detecting and imaging are realized. Due to the adoption of the microbridge structure and the preparation method disclosed by the invention, the problems of microbridge deformation caused by adding the metamaterial and the like are solved, and the microbolometer is high in mechanical stability and terahertz absorptivity. The defect that terahertz waves are difficultly detected by using the traditional microbolometer is overcome; and the terahertz microbolometer is prepared by using the traditional micromachining technology so as to be suitable for industrial production.