Kang Guoguo, Vartiainen Ismo, Bai Benfeng, Turunen Jari
Department of Physics and Mathematics, University of Eastern Finland (Joensuu Campus), Joensuu, Finland.
Opt Express. 2011 Jan 17;19(2):770-8. doi: 10.1364/OE.19.000770.
The performance of infrared (IR) dual-band detector can be substantially improved by simultaneously increasing IR absorptions for both sensor bands. Currently available methods only provide absorption enhancement for single spectral band, but not for the dual-band. The Fabry-Perot (FP) cavity generates a series of resonances in multispectral bands. With this flexibility, we introduced a novel type of dual-band detector structure containing a multilayer FP cavity with two absorbing layers and a subwavelength-period grating mirror, which is capable of simultaneously enhancing the middle wave infrared (MWIR) and the long wave infrared (LWIR) detection. Compared with the bare-absorption-layer detector (common dual-band detector), the optimized FP cavity can provide about 13 times and 17 times absorption enhancement in LWIR and MWIR bands respectively.
通过同时增加两个传感器波段的红外吸收，红外（IR）双波段探测器的性能可以得到显著提升。目前可用的方法仅能增强单光谱波段的吸收，而非双波段。法布里-珀罗（FP）腔在多光谱波段产生一系列共振。基于这种灵活性，我们引入了一种新型双波段探测器结构，它包含一个带有两个吸收层的多层FP腔和一个亚波长周期光栅镜，能够同时增强中波红外（MWIR）和长波红外（LWIR）探测。与裸吸收层探测器（普通双波段探测器）相比，优化后的FP腔在LWIR和MWIR波段分别可提供约13倍和17倍的吸收增强。
