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 m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-07-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/20/15/4087 |
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| author | Dovilė Čibiraitė-Lukenskienė Kęstutis Ikamas Tautvydas Lisauskas Viktor Krozer Hartmut G. Roskos Alvydas Lisauskas |
| author_facet | Dovilė Čibiraitė-Lukenskienė Kęstutis Ikamas Tautvydas Lisauskas Viktor Krozer Hartmut G. Roskos Alvydas Lisauskas |
| author_sort | Dovilė Čibiraitė-Lukenskienė |
| collection | DOAJ |
| description | 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/<inline-formula> <math display="inline"> <semantics> <msqrt> <mi>Hz</mi> </msqrt> </semantics> </math> </inline-formula>, 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<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mn>2</mn> </msup> </semantics> </math> </inline-formula>-sized image of the fingers of a hand with a pixel size of 1 mm<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mn>2</mn> </msup> </semantics> </math> </inline-formula> 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. |
| first_indexed | 2024-03-10T18:18:26Z |
| format | Article |
| id | doaj.art-f80a7fa841074b1c91b25e15c8283239 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T18:18:26Z |
| publishDate | 2020-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-f80a7fa841074b1c91b25e15c82832392023-11-20T07:35:06ZengMDPI AGSensors1424-82202020-07-012015408710.3390/s20154087Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz DetectorDovilė Čibiraitė-Lukenskienė0Kęstutis Ikamas1Tautvydas Lisauskas2Viktor Krozer3Hartmut G. Roskos4Alvydas Lisauskas5Physikalisches Institut, J. W. Goethe University Frankfurt, 60438 Frankfurt, GermanyInstitute of Applied Electrodynamics and Telecommunications, Vilnius University, 10257 Vilnius, LithuaniaMB “Terahertz Technologies”, 01116 Vilnius, LithuaniaPhysikalisches Institut, J. W. Goethe University Frankfurt, 60438 Frankfurt, GermanyPhysikalisches Institut, J. W. Goethe University Frankfurt, 60438 Frankfurt, GermanyPhysikalisches Institut, J. W. Goethe University Frankfurt, 60438 Frankfurt, GermanyThis 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/<inline-formula> <math display="inline"> <semantics> <msqrt> <mi>Hz</mi> </msqrt> </semantics> </math> </inline-formula>, 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<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mn>2</mn> </msup> </semantics> </math> </inline-formula>-sized image of the fingers of a hand with a pixel size of 1 mm<inline-formula> <math display="inline"> <semantics> <msup> <mrow></mrow> <mn>2</mn> </msup> </semantics> </math> </inline-formula> 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.https://www.mdpi.com/1424-8220/20/15/4087passive imaginghuman-body radiationTHz detectionTeraFETfield-effect transistorterahertz |
| spellingShingle | Dovilė Čibiraitė-Lukenskienė Kęstutis Ikamas Tautvydas Lisauskas Viktor Krozer Hartmut G. Roskos Alvydas Lisauskas Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector Sensors passive imaging human-body radiation THz detection TeraFET field-effect transistor terahertz |
| title | Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector |
| title_full | Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector |
| title_fullStr | Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector |
| title_full_unstemmed | Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector |
| title_short | Passive Detection and Imaging of Human Body Radiation Using an Uncooled Field-Effect Transistor-Based THz Detector |
| title_sort | passive detection and imaging of human body radiation using an uncooled field effect transistor based thz detector |
| topic | passive imaging human-body radiation THz detection TeraFET field-effect transistor terahertz |
| url | https://www.mdpi.com/1424-8220/20/15/4087 |
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