AUTHOR=Wu Jianqing , Tao Jia-Jia , Zhang Chuansheng , Zhang Haoxing , Zhang Lei , Chen Dong , Wang Xiaodong 

TITLE=The high-performance linear scan imaging system of terahertz Si-based blocked-impurity-band detector

JOURNAL=Frontiers in Electronic Materials

VOLUME=2

YEAR=2023

URL=https://www.frontiersin.org/journals/electronic-materials/articles/10.3389/femat.2022.1107802

DOI=10.3389/femat.2022.1107802

ISSN=2673-9895

ABSTRACT=<p>Terahertz (THz) Si-based blocked-impurity-band (BIB) detector is becoming the overwhelming choice for applications in space-based instruments, airborne, and imaging systems. A high-performance linear scan imaging system based on the THz Si-based BIB detector is designed. Through the optimized design of cryogenic Dewar and a suitable optical system, the imaging system reduces background stray radiation, and then improves the THz imaging performance of the detector. At the temperature of 4.2 K and the bias of 2.6V, the blackbody peak responsivity of the Si-based BIB detector is 23.77A/W, while the dark current is <inline-formula id="inf1"><mml:math id="m1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>4.72</mml:mn><mml:mo>×</mml:mo><mml:msup><mml:mn>10</mml:mn><mml:mrow><mml:mo>−</mml:mo><mml:mn>11</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula> A and the corresponding responsivity non-uniformity is less than 6.8%. Moreover, the experiment results show that the noise equivalent temperature difference (NETD) of the whole system reaches 10mK, and the spatial resolution reaches 50 µm. This work is beneficial to the larger scale array integrated BIB imaging system.</p>