Pyroelectric infrared detectors are widely used owing to their uncooling characteristic and full infrared spectrum response. However, the increased volume and complex fabrication process due to the presence of an optical filter or resonant cavity, which is required to realize wavelength selection for every special application, makes it difficult to fabricate an integrated pyroelectric detector. Herein, we propose a wavelength-selective absorbing infrared detector in which a pyroelectric material is integrated with a metamaterial perfect absorber (MPA). A LiTaO₃ single crystal with a metallic film on both sides was selected as the substrate, and a metal-dielectric-metal (MDM)-type MPA was deposited on its top. The MPA structure, consisting of a SiO₂ dielectric layer and cross-type periodic units, provided a high selective absorption at 3.16 μm. With the incident radiation power transferred into heat by the dielectric layer and diffused into LiTaO₃, a pyroelectric voltage was generated. This integration resulted in an infrared detector with a ∼90 % absorption at 3.16 μm and a detectivity of 3.2 × 10⁷ cm Hz^1/2W⁻¹ at 26.3 Hz.

热释电红外探测器由于其降温特性和完整的红外光谱响应而被广泛使用。然而，由于存在滤光器或谐振腔的增加的体积和复杂的制造过程，这是实现每种特殊应用的波长选择所必需的，这使得难以制造集成的热释电探测器。在这里，我们提出一种波长选择吸收红外探测器，其中热电材料与超材料完美吸收体（MPA）集成在一起。选择两面都带有金属膜的LiTaO ₃单晶作为衬底，并在其顶部沉积金属-电介质-金属（MDM）型MPA。MPA结构，由SiO ₂组成介电层和十字型周期单元在3.16μm处提供了高选择性吸收。随着入射辐射功率被介电层传递到热中并扩散到LiTaO _3中，产生了热释电电压。这种整合导致红外探测器在3.16μm处具有约90％的吸收率，在26.3 Hz处的探测率为3.2×10 ⁷ cm Hz ^1/2 W ^-1。