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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...

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Autores principales: Hack, Erwin, Valzania, Lorenzo, Gäumann, Gregory, Shalaby, Mostafa, Hauri, Christoph P., Zolliker, Peter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801597/
https://www.ncbi.nlm.nih.gov/pubmed/26861341
http://dx.doi.org/10.3390/s16020221
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author Hack, Erwin
Valzania, Lorenzo
Gäumann, Gregory
Shalaby, Mostafa
Hauri, Christoph P.
Zolliker, Peter
author_facet Hack, Erwin
Valzania, Lorenzo
Gäumann, Gregory
Shalaby, Mostafa
Hauri, Christoph P.
Zolliker, Peter
author_sort Hack, Erwin
collection PubMed
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.
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spelling pubmed-48015972016-03-25 Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz Imaging Hack, Erwin Valzania, Lorenzo Gäumann, Gregory Shalaby, Mostafa Hauri, Christoph P. Zolliker, Peter Sensors (Basel) Article 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. MDPI 2016-02-06 /pmc/articles/PMC4801597/ /pubmed/26861341 http://dx.doi.org/10.3390/s16020221 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hack, Erwin
Valzania, Lorenzo
Gäumann, Gregory
Shalaby, Mostafa
Hauri, Christoph P.
Zolliker, Peter
Comparison of Thermal Detector Arrays for Off-Axis THz Holography and Real-Time THz 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 Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4801597/
https://www.ncbi.nlm.nih.gov/pubmed/26861341
http://dx.doi.org/10.3390/s16020221
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