为了实现红外波段的双频带完美吸收，采用将不同电子掺杂浓度的单层带状黑磷在同一平面内交错排列的方法，进行了理论分析和仿真模拟，得到了此器件在红外波段的吸收光谱和传感性能。结果表明，此吸收体可以在波长2 μm~5 μm的红外波段范围内实现双频带的完美吸收（吸收率大于99.9%）,此高吸收率是由于入射光波与器件满足了临界耦合条件而形成了共振加强; 在共振波长处，光波被限制在黑磷附近; 此超材料吸收体的双频带特性在其作为传感器使用时具有独特的优势，可以提高传感器的可靠性和准确性; 吸收波峰的偏移量与覆盖在此器件上的未知物质的折射率基本呈线性关系，用此器件测得的未知物质的折射率与实际的折射率的误差在1%以内。该超材料吸收体结构简单，对制作工艺的尺寸精确度要求不高，在红外波段的多频带吸收和传感检测方面将会有广泛的应用。

In order to realize dual-band perfect absorption in the infrared wavelength range, single-layer black phosphorus ribbons were arranged in parallel with alternating carrier doping concentration. Theoretical analysis and optical simulation were performed to get absorption spectra and sensing characteristics of the device in the infrared wavelength range. The results show the proposed device can achieve dual-band perfect absorption (>99.9% absorption efficiency) in the 2 μm~5 μm infrared wavelength range. The high absorption is caused by the critical coupling of incident light to the device, and instructive resonance is formed; the on-resonance light is restricted around black phosphorus; the dual-band absorption characteristic of the metamaterial makes it an ideal sensor with high reliability and accuracy; shift of absorption peaks is almost in a linear relationship with change of refractive index of cladding material. The margin of error between the calculated and actual refractive index is within 1%. The simple structure and reasonable tolerance in dimension deviation make the proposed metamaterial a good candidate for applications such as multiple-band absorption and sensing in the infrared wavelength range.