Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging
In terahertz (THz) materials science, imaging by scanning prevails when low power THz sources are used. However, the application of array detectors operating with high power THz sources is increasingly reported. We compare the imaging properties of four different array detectors that are able to rec...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2016-02-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/16/2/221 |
| _version_ | 1798042299404386304 |
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| author | Erwin Hack Lorenzo Valzania Gregory Gäumann Mostafa Shalaby Christoph P. Hauri Peter Zolliker |
| author_facet | Erwin Hack Lorenzo Valzania Gregory Gäumann Mostafa Shalaby Christoph P. Hauri Peter Zolliker |
| author_sort | Erwin Hack |
| collection | DOAJ |
| description | In terahertz (THz) materials science, imaging by scanning prevails when low power THz sources are used. However, the application of array detectors operating with high power THz sources is increasingly reported. We compare the imaging properties of four different array detectors that are able to record THz radiation directly. Two micro-bolometer arrays are designed for infrared imaging in the 8–14 μm wavelength range, but are based on different absorber materials (i) vanadium oxide; (ii) amorphous silicon; (iii) a micro-bolometer array optimized for recording THz radiation based on silicon nitride; and (iv) a pyroelectric array detector for THz beam profile measurements. THz wavelengths of 96.5 μm, 118.8 μm, and 393.6 μm from a powerful far infrared laser were used to assess the technical performance in terms of signal to noise ratio, detector response and detectivity. The usefulness of the detectors for beam profiling and digital holography is assessed. Finally, the potential and limitation for real-time digital holography are discussed. |
| first_indexed | 2024-04-11T22:33:36Z |
| format | Article |
| id | doaj.art-0d537b99363d487a8b3413d14de9b588 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T22:33:36Z |
| publishDate | 2016-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-0d537b99363d487a8b3413d14de9b5882022-12-22T03:59:17ZengMDPI AGSensors1424-82202016-02-0116222110.3390/s16020221s16020221Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz ImagingErwin Hack0Lorenzo Valzania1Gregory Gäumann2Mostafa Shalaby3Christoph P. Hauri4Peter Zolliker5Reliability Science and Technology Laboratory, Empa, Überlandstrasse 129, CH-8600 Dübendorf, SwitzerlandReliability Science and Technology Laboratory, Empa, Überlandstrasse 129, CH-8600 Dübendorf, SwitzerlandInstitute of Applied Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, SwitzerlandSwissFEL Laser Group, Paul Scherrer Institute, CH-5232 Villigen PSI, SwitzerlandSwissFEL Laser Group, Paul Scherrer Institute, CH-5232 Villigen PSI, SwitzerlandReliability Science and Technology Laboratory, Empa, Überlandstrasse 129, CH-8600 Dübendorf, SwitzerlandIn terahertz (THz) materials science, imaging by scanning prevails when low power THz sources are used. However, the application of array detectors operating with high power THz sources is increasingly reported. We compare the imaging properties of four different array detectors that are able to record THz radiation directly. Two micro-bolometer arrays are designed for infrared imaging in the 8–14 μm wavelength range, but are based on different absorber materials (i) vanadium oxide; (ii) amorphous silicon; (iii) a micro-bolometer array optimized for recording THz radiation based on silicon nitride; and (iv) a pyroelectric array detector for THz beam profile measurements. THz wavelengths of 96.5 μm, 118.8 μm, and 393.6 μm from a powerful far infrared laser were used to assess the technical performance in terms of signal to noise ratio, detector response and detectivity. The usefulness of the detectors for beam profiling and digital holography is assessed. Finally, the potential and limitation for real-time digital holography are discussed.http://www.mdpi.com/1424-8220/16/2/221terahertzdigital holographyarray detectormicro-bolometerpyroelectric detectorreal time imaging |
| spellingShingle | Erwin Hack Lorenzo Valzania Gregory Gäumann Mostafa Shalaby Christoph P. Hauri Peter Zolliker Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging Sensors terahertz digital holography array detector micro-bolometer pyroelectric detector real time imaging |
| title | Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging |
| title_full | Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging |
| title_fullStr | Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging |
| title_full_unstemmed | Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging |
| title_short | Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging |
| title_sort | comparison of thermal detector arrays for off axis thz holography and real time thz imaging |
| topic | terahertz digital holography array detector micro-bolometer pyroelectric detector real time imaging |
| url | http://www.mdpi.com/1424-8220/16/2/221 |
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