Image data acquired with fused multispectral information can be used for effective identification and navigation owing to additional information beyond human vision, including thermal distribution, night vision, and molecular composition. However, the construction of photodetectors with such capabilities is hindered by the structural complexity arising from the integration of multiple semiconductor junctions with distinct energy gaps and lattice constants. In this work, we develop a colloidal quantum-dot dual-mode detector capable of detecting, separating, and fusing photons from various wavelength ranges. Using three vertically stacked colloidal quantum-dot homojunctions with alternating polarity, single-band short-wave infrared imaging and fused-band imaging (short-wave and mid-wave infrared) can be achieved with the same detector by controlling bias polarity and magnitude. The dual-mode detectors show detectivity up to 8×1010 Jones at the fused-band mode and 3.1×1011 Jones at the single-band mode, respectively. Without image post-processing algorithms, the dual-mode detectors could provide both night vision and thermal information-enhanced night vision imaging capability. To the best of our knowledge, this is the first colloidal quantum-dot detector that can achieve such functionality. The operation mode can be changed at a high frequency up to 1.7 MHz, making it possible to achieve simultaneously dual-mode imaging and remote temperature sensing.

Shuo Zhang;Ge Mu;Jie Cao;Yuning Luo;Qun Hao;Menglu Chen;Yimei Tan;Pengfei Zhao;Xin Tang

School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China;Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, Beijing 100081, China;Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China;e-mail: qhao@bit.edu.cn;e-mail: menglu@bit.edu.cn;e-mail: xintang@bit.edu.cn

光子学研究（英文）

[1]Shuo Zhang;Ge Mu;Jie Cao;Yuning Luo;Qun Hao;Menglu Chen;Yimei Tan;Pengfei Zhao;Xin Tang-.Single-/fused-band dual-mode mid-infrared imaging with colloidal quantum-dot triple-junctions)[J].光子学研究（英文）,2022(08):1987

homojunctions

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