Bernal-Stacked双层石墨烯1.06μm谐振增强型光电探测器设计方法

Design method of Bernal-Stacked bilayer graphene 1.06 μm resonance-enhanced photodetector

石墨烯对光的吸收率较低,通过与光学谐振腔结合限制光场,可有效提高石墨烯探测器件对入射光的吸收.以电磁场传输理论为基础,推导了双层石墨烯光学谐振腔中的光场分布,建立了谐振增强型光电探测器传输矩阵数理模型,对Bernal-Stacked双层石墨烯的谐振增强型光电探测器结构参数进行数值计算,并对探测器性能进行分析.结果表明,设计的探测波长为1. 06μm谐振增强结构光电探测器,双层石墨烯的光吸收率达到96. 78%,大幅提升了对微弱光信号的探测能力.

Graphene has a low absorption rate of light.By combining with an optical resonant cavity to restrict the light field,the absorption rate of the graphene detector element can be effectively improved.Based on the theory of electromagnetic field transmission,the optical field distribution in the bilayer graphene optical resonator is deduced,a mathematical model for the transmission matrix of the resonant enhanced photodetector is established,and a resonant enhanced photodetector for the Bernal-Stacked bilayer graphene is established.The structural parameters are numerically calculated and the detector performance is analyzed.The results show that,the optical absorption rate of bilayer graphene reaches up to 96.78%for a 1.06μm wavelength resonant enhanced photodetector,which greatly improves the detection ability of weak optical signals.