Tang Xin, Ackerman Matthew M, Guyot-Sionnest Philippe
James Franck Institute, The University of Chicago , 929 East 57th Street , Chicago , Illinois 60637 , United States.
ACS Nano. 2018 Jul 24;12(7):7362-7370. doi: 10.1021/acsnano.8b03871. Epub 2018 Jul 11.
Thermal imaging in the midwave infrared plays an important role for numerous applications. The key functionality is imaging devices in the atmospheric window between 3 and 5 μm, where disturbance from fog, dust, and other atmospheric influence could be avoided. Here, we demonstrate sensitive thermal imaging with HgTe colloidal quantum dot (CQD) photovoltaic detectors by integrating the HgTe CQDs with plasmonic structures. The responsivity at 5 μm is enhanced 2- to 3-fold over a wide range of operating temperatures from 295 to 85 K. A detectivity of 4 × 10 Jones is achieved at cryogenic temperature. The noise equivalent temperature difference is 14 mK at an acquisition rate of 1 kHz for a 200 μm pixel. Thermal images are captured with a single-pixel scanning imaging system.
中波红外热成像在众多应用中发挥着重要作用。关键功能是在3至5μm的大气窗口中的成像设备，在此可避免雾、灰尘和其他大气影响带来的干扰。在此，我们通过将HgTe胶体量子点（CQD）与等离子体结构集成，展示了基于HgTe胶体量子点光伏探测器的灵敏热成像。在295至85K的宽工作温度范围内，5μm处的响应率提高了2至3倍。在低温下实现了4×10琼斯的探测率。对于200μm像素，在1kHz的采集速率下，噪声等效温差为14mK。利用单像素扫描成像系统捕获热图像。
