With the increasing demand for small-scale photodetector devices, quantum dot-based infrared photodetectors have attracted more and more attention in the past decades. In this work, periodic metal nanohole array structures are introduced to the quantum dot infrared photodetectors to enhance the photon absorptivity performance via the surface plasmon enhancement effect in order to overcome the bottleneck of low optical absorption efficiency that exists in conventional photodetectors. The results demonstrate that the optimized metal nanohole array structures can greatly enhance the photon absorptivity up to 86.47% in the specific photodetectors, which is 1.89 times than that of conventional photodetectors without the metal array structures. The large enhancement of the absorptivity can be attributed to the local coupling surface plasmon effect caused by the metal nanohole array structures. It is believed that the study can provide certain theoretical guidance for high-performance nanoscale quantum dot-based infrared photodetectors.

中文翻译：

---

金属纳米孔阵列的表面等离激元效应实现了量子点红外光电探测器的高光子吸收率。

随着对小型光电检测器设备的需求的增加，在过去的几十年中，基于量子点的红外光电检测器引起了越来越多的关注。在这项工作中，周期性的金属纳米孔阵列结构被引入到量子点红外光电探测器中，以通过表面等离子体增强效应来增强光子吸收性能，从而克服了常规光电探测器中存在的低光吸收效率的瓶颈。结果表明，优化的金属纳米孔阵列结构可以在特定的光电探测器中最大程度地提高光子吸收率，达到86.47％，是没有金属阵列结构的传统光电探测器的1.89倍。吸收率的大幅提高可归因于由金属纳米孔阵列结构引起的局部耦合表面等离子体激元效应。相信这项研究可以为高性能的纳米级量子点基红外光电探测器提供一定的理论指导。