Broadband THz to NIR up-converter for photon-type THz imaging

Peng Bai, Yueheng Zhang (), Tianmeng Wang, Zhanglong Fu, Dixiang Shao, Ziping Li, Wenjian Wan, Hua Li, Juncheng Cao, Xuguang Guo and Wenzhong Shen
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Peng Bai: Shanghai Jiao Tong University
Yueheng Zhang: Shanghai Jiao Tong University
Tianmeng Wang: Shanghai Jiao Tong University
Zhanglong Fu: Chinese Academy of Sciences
Dixiang Shao: Chinese Academy of Sciences
Ziping Li: Chinese Academy of Sciences
Wenjian Wan: Chinese Academy of Sciences
Hua Li: Chinese Academy of Sciences
Juncheng Cao: Chinese Academy of Sciences
Xuguang Guo: University of Shanghai for Science and Technology
Wenzhong Shen: Shanghai Jiao Tong University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract High performance terahertz imaging devices have drawn wide attention due to their significant application in healthcare, security of food and medicine, and nondestructive inspection, as well as national security applications. Here we demonstrate a broadband terahertz photon-type up-conversion imaging device, operating around the liquid helium temperature, based on the gallium arsenide homojunction interfacial workfunction internal photoemission (HIWIP)-detector-LED up-converter and silicon CCD. Such an imaging device achieves broadband response in 4.2–20 THz and can absorb the normal incident light. The peak responsivity is 0.5 AW−1. The light emitting diode leads to a 72.5% external quantum efficiency improvement compared with the one widely used in conventional up-conversion devices. A peak up-conversion efficiency of 1.14 × 10−2 is realized and the optimal noise equivalent power is 29.1 pWHz−1/2. The up-conversion imaging for a 1000 K blackbody pin-hole is demonstrated. This work provides a different imaging scheme in the terahertz band.

Date: 2019
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DOI: 10.1038/s41467-019-11465-6

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