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Open AccessArticle

Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector

1
Physikalisches Institut, J. W. Goethe University Frankfurt, 60438 Frankfurt, Germany
2
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, 10257 Vilnius, Lithuania
3
The General Jonas Žemaitis Military Academy of Lithuania, 10322 Vilnius, Lithuania
4
MB “Terahertz Technologies”, 01116 Vilnius, Lithuania
5
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH), 12489 Berlin, Germany
6
CENTERA Laboratories, Institute of High Pressure Physics PAS, 01-142 Warsaw, Poland
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(15), 4087; https://doi.org/10.3390/s20154087
Received: 11 June 2020 / Revised: 16 July 2020 / Accepted: 20 July 2020 / Published: 22 July 2020
(This article belongs to the Special Issue Terahertz Imaging and Sensors)
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/ 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 × 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. View Full-Text
Keywords: passive imaging; human-body radiation; THz detection; TeraFET; field-effect transistor; terahertz passive imaging; human-body radiation; THz detection; TeraFET; field-effect transistor; terahertz
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MDPI and ACS Style

Čibiraitė-Lukenskienė, D.; Ikamas, K.; Lisauskas, T.; Krozer, V.; Roskos, H.G.; Lisauskas, A. Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector. Sensors 2020, 20, 4087. https://doi.org/10.3390/s20154087

AMA Style

Čibiraitė-Lukenskienė D, Ikamas K, Lisauskas T, Krozer V, Roskos HG, Lisauskas A. Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector. Sensors. 2020; 20(15):4087. https://doi.org/10.3390/s20154087

Chicago/Turabian Style

Čibiraitė-Lukenskienė, Dovilė; Ikamas, Kęstutis; Lisauskas, Tautvydas; Krozer, Viktor; Roskos, Hartmut G.; Lisauskas, Alvydas. 2020. "Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector" Sensors 20, no. 15: 4087. https://doi.org/10.3390/s20154087

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