Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector
Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector
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DOI：
10.3390/s20154087
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发表时间：
2020-08-01
期刊：
影响因子：
3.9
通讯作者：
Lisauskas, Alvydas
中科院分区：
文献类型：
--
作者：
Cibiraite-Lukenskiene, Dovile;Ikamas, Kestutis;Lisauskas, Alvydas
据我们所知，这项工作提出了第一个完全被动成像与人体发射的辐射在较低的太赫兹频率范围内使用宽带非制冷探测器。该传感器由一个集成对数螺旋太赫兹天线的硅CMOS场效应晶体管。该THz传感器在0.1 - 1.5 THz频率范围内表现出相当平坦的响应度，光学响应度和噪声等效功率的值分别约为40 mA/W和42 pW/root Hz。这些值与模拟结果非常一致，模拟结果表明，平坦响应率范围超过2.0 THz。成功的成像证明了这种传感器可以实现的令人印象深刻的热灵敏度。以1 mm/s的扫描速度记录2.3 x 7.5 cm（2）大小的手指图像，像素大小为1 mm（2），信噪比为2，噪声等效温差为4.4 K。这种方法显示了一种新的传感方法与场效应晶体管作为太赫兹探测器，通常用于主动太赫兹检测。
This work presents, to our knowledge, the first completely passive imaging with human-body-emitted radiation in the lower THz frequency range using a broadband uncooled detector. The sensor consists of a Si CMOS field-effect transistor with an integrated log-spiral THz antenna. This THz sensor was measured to exhibit a rather flat responsivity over the 0.1-1.5-THz frequency range, with values of the optical responsivity and noise-equivalent power of around 40 mA/W and 42 pW/root Hz, respectively. These values are in good agreement with simulations which suggest an even broader flat responsivity range exceeding 2.0 THz. The successful imaging demonstrates the impressive thermal sensitivity which can be achieved with such a sensor. Recording of a 2.3 x 7.5-cm(2)-sized image of the fingers of a hand with a pixel size of 1 mm(2) at a scanning speed of 1 mm/s leads to a signal-to-noise ratio of 2 and a noise-equivalent temperature difference of 4.4 K. This approach shows a new sensing approach with field-effect transistors as THz detectors which are usually used for active THz detection.