甚长波量子阱红外探测器光栅耦合的研究  

The grating optical coupling of the very long wavelength quantum well infrared photodetectors

作　　者：熊大元[1] 曾勇[1] 李宁[1] 陆卫[1] 

机构地区：[1]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083

出　　处：《物理学报》2006年第7期3642-3648,共7页Acta Physica Sinica

基　　金：国家自然科学重点基金项目(批准号:10234040);上海市科学技术委员会重点项目(批准号:02DJ14066);国家自然科学基金(批准号:60476040);上海市信息化专项基金(批准号:2003010);国家重点基础研究基金(批准号:2001CB610470)资助的课题.~~

摘　　要：采用平面波展开的散射矩阵方法研究n型甚长波量子阱红外探测器的二维衍射光栅,并同时从实验方面研究了其红外透射光谱.研究表明,n型量子阱器件的光栅耦合是传输场和倏逝场共同作用的结果.对于n型量子阱红外探测器的光栅耦合,光栅周期、光栅深度和占空比三者之间相互影响;要达到好的光学耦合效果,需要根据量子阱器件的峰值探测波长选择合适的光栅参数.Because of the isotropic energy band structure of the Г electrons in the GaAs/AlGaAs quantum well infrared photodetector （ QWIP）, normal incident radiation absorption is forbidden, so that the optimization of optical grating becomes a key technology. In this work we present a scattering-matrix method based on plane-wave expansion for the two-dimensional QWIP grating. The transmission spectrum of the QWIP grating has been studied theoretically and experimentally. It has been shown that in general, both the propagating wave and the evanescent wave contribute to the optical coupling in n-type QWIP. The grating parameters, like period, depth and filling factor, will strongly affect the optical coupling.

关 键 词：n型量子阱红外探测器 二维光栅 光耦合 

分 类 号：TN215[电子电信—物理电子学] TN248.4