Near-Infrared Photodetectors Based on Self-Assembled Plasmonic Architecture for Computational Single-Pixel Imaging

Transition metal dichalcogenides (TMDs) with excellent optoelectronic properties show great promise in sensing and imaging applications. However, TMDs-based photodetectors suffer from a low light absorption volume and complex procedures for fabricating detector arrays, which pose great challenges to obtaining high-resolved images. Herein, an efficient computational single-pixel imaging system based on the high-performance molybdenum selenide (MoSe2) photodetector is proposed. By introducing an exquisite plasmonic nanostructure [Au nanoparticles decorated anodic aluminum oxide (Au-AAO)], the light-matter interaction is improved. Specifically, the reflected light beams are spatially concentrated and electromagnetic fields are clearly strengthened, which facilitates efficient light utilization, leading to an improved light absorption. Accordingly, the resulted MoSe2/Au-AAO photodetector exhibits excellent photoresponse, including a short response time of 40~\mu \text{s} , a high responsivity of 1209 mAW ^{-{1}} , and a detectivity of 1.74\times 10^{{13}} Jones. Subsequently, a single-pixel imaging system is demonstrated, which enables the capture of high-resolved near-infrared images. This imaging system does not require conventional detector arrays and readout circuits, providing an alternative approach for low-cost and simple imaging applications.