长波量子阱红外光电探测器金属光栅耦合的研究——基于金属表面等离子效应

The metal grating coupling of long-wavelength quantum well infrared photodetectors: surface plasmon effect

采用时域有限差分法研究了二维金属光栅量子阱红外探测器的电磁场分布,研究表明充分利用金属表面等离子效应可显著提高量子阱红外探测器光耦合效率.研究还表明,对于8μm长波量子阱红外探测器,金属光栅结构选取圆孔直径与光栅周期比为0.8～0.9是最有益的,此时可获得最大的光耦合效率.

The distribution of electromagnetic field of 2D metal grating in the Long-Wavelength Quantum Well Infrared Photodetectors（LW-QWIPs） was studied by Finite Time Domain Method（FDTD）.The result shows that making good use of the surface plasmons can remarkably improve the optical coupling efficiency in the LW-QWIPs.It also shows that using a metal grating with the ratio of the hole diameter to the grating period ranged from 0.8 to 0.9,optimal optical coupling can be achieved.