Abstract
Blocked-impurity-band (BIB) device becomes a prevalent terahertz detection technology, but its overall optical performance, such as quantum efficiency, is constrained by the thickness of the absorption layer. Metamaterial absorbers can effectively concentrate and absorb terahertz waves at a subwavelength scale, and their ultra-thin thickness facilitates device integration. A multi-band metamaterial absorber is developed and simulated tailored for the working band of Ge-doped BIB detectors. The design is founded on a three-layer structure with Ti rectangular resonator, Ge dielectric layer, and Ti reflective layer. This configuration achieves two absorption peaks at 74.16 μm and 92.09 μm, with optical absorption reaching 95.66% and 97.29%, respectively. The operating wavelength can be regulated by altering the geometric parameters of the rectangular resonator, and it exhibits angle-insensitive properties under small-angle incidence. These findings enhance the application of BIB detectors in terahertz detection technology, potentially improving their performance in deep space exploration.
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