Van der Waals two-color infrared detection

Light:Science&Applications 11, 6 (2022) Two-color infrared detection technology realizes target recognition in a complex environment by using the multi-spectral characteristics of the target. In the last decade, several papers have announced the usefulness of the 2D materials for high operating temperature photodetectors covering infrared spectral regions. Researchers from Shanghai Institute of Technical Physics of Chinese Acad-emy of Sciences, Huazhong University of Science and Technology, and Fudan University demonstrated an uncooled two-color infrared photodetector based on van der Waals heterojunction. This two-color photodetector can detect near-infrared and mid-wave infrared at the same time, and with ultra-low crosstalk, it realizes spectral blackbody detection with temporal and spatial coherence. Its room temperature operating ability greatly reduces the volume, weight, and power consumption of the detection components, and demonstrates the application prospects of van der Waals heterostructures in the miniaturized and intelligent photodetection systems.