Passive detection and imaging of human body radiation using an uncooled field-effect transistor-based THz detector
- 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 demonstratestheimpressivethermalsensitivitywhichcanbeachievedwithsuchasensor. Recording of a 2.3×7.5-cm2-sized image of the fingers of a hand with a pixel size of 1 mm2 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.
Author: | Dovilé Čibiraitė-Lukenskienė, Kęstutis Ikamas, Tautvydas Lisauskas, Viktor KrozerORCiDGND, Hartmut RoskosORCiDGND, Alvydas LisauskasORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-554695 |
DOI: | https://doi.org/10.3390/s20154087 |
ISSN: | 1424-8220 |
Parent Title (English): | Sensors |
Publisher: | MDPI |
Place of publication: | Basel |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2020/07/22 |
Date of first Publication: | 2020/07/22 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2020/08/26 |
Tag: | THz detection; TeraFET; human-body radiation; passive imaging; terahertz; field-effect transistor |
Volume: | 20 |
Issue: | 15 |
Page Number: | 14 |
First Page: | 1 |
Last Page: | 14 |
Note: | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
HeBIS-PPN: | 471031151 |
Institutes: | Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Open-Access-Publikationsfonds: | Physik |
Licence (German): | Creative Commons - Namensnennung 4.0 |