基于SP增强吸收的非制冷LWIR/VLWIR双色探测器研究

为解决长波（LWIR）-甚长波红外(VLWIR)双色探测器发展中面临的材料受限、衍射极限等问题，项目提出利用表面等离激元（SP）增强吸收实现非制冷红外探测器的长波-甚长波红外双色探测。主要研究内容：（1）表面等离激元增强吸收结构与其光-热转换机理；（2）增强吸收结构应用于双色非制冷红外探测器的集成方式、器件物理和性能。其意义：（1）基于增强吸结构的红外探测器可将红外辐射聚集到小于辐射波长的像元上，突破衍射极限、提高探测器规模；（2）基于增强吸结构的红外探测器在目标波长吸收率可达90%以上；（3）增强吸收具有波长选择性且可实现宽带吸收，拓宽了探测器吸收层材料的响应谱段和带宽；（4）非制冷双色探测器的研制为低成本、大面阵双色探测器提供了理论和技术基础。

To figure out issues including the diffraction limitation and detector materials for long-wave infrared(LWIR) and very long-wave infrared(VLWIR) dual-band detector, we propose a utilization of surface palsmonic-enhanced absorption to realize LWIR/VLWIR dual-band detection with uncooled infrared detectors. The investigation mainly includes: (1) Absorption enhanced structures based on surface palsmon and the mechanism of light-heat conversion; (2) Their applications for dual-band uncooled infrared detector, ways of integration, device physics and performance. This arrangement has merits of: (1) Detector pixel based on absorption enhanced structures can be designed in a smaller size beyond the diffraction limited, increasing the array dimensions. (2) Absorption of the integrated detector can reach more than 90% at target wavelength. (3) Wavelength-selective and broadband properties of absorption enhanced structures broaden the spectral response and bandwidth of the detector. (4) This research will serve as a theoretical and technical underpinning for low cost and large array dual-band uncooled infrared detector.