THz Imaging Using a Quantum-Well Photodetector with Background Limited Performance
ZHOU Tao, ZHANG Rong, GUO Xu-Guang, TAN Zhi-Yong, CAO Jun-Cheng**
Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050
Abstract ：Terahertz (THz) quantum well photodetectors (QWPs) are an extension of quantum well infrared photodetectors in the THz region. We construct an imaging system based on a THz QWP with a narrow response range from 3 THz to 6 THz. The peak responsivity of the THz QWP having background-limited performance is about 0.5 A/W, and the corresponding detectivity reaches 1011 cm?Hz1/2 /W at temperature of 4.2 K. We obtain the images of a concealed object by the imaging system and prove that THz QWPs have the potential for imaging applications.
收稿日期: 2012-07-27
出版日期: 2012-10-01
:
42.79.Pw
(Imaging detectors and sensors)
42.30.Wb
(Image reconstruction; tomography)
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2012, Vol. 29 
