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Real-time terahertz imaging with a single-pixel detector

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Ivanov Stantchev, Rayko , Yu, Xiao, Blu, Thierry and Pickwell-MacPherson, Emma (2020) Real-time terahertz imaging with a single-pixel detector. Nature Communications, 11 . 2535 . doi:10.1038/s41467-020-16370-x ISSN 2041-1723.

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Official URL: https://doi.org/10.1038/s41467-020-16370-x

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Abstract

Terahertz (THz) radiation is poised to have an essential role in many imaging applications, from industrial inspections to medical diagnosis. However, commercialization is prevented by impractical and expensive THz instrumentation. Single-pixel cameras have emerged as alternatives to multi-pixel cameras due to reduced costs and superior durability. Here, by optimizing the modulation geometry and post-processing algorithms, we demonstrate the acquisition of a THz-video (32 × 32 pixels at 6 frames-per-second), shown in real-time, using a single-pixel fiber-coupled photoconductive THz detector. A laser diode with a digital micromirror device shining visible light onto silicon acts as the spatial THz modulator. We mathematically account for the temporal response of the system, reduce noise with a lock-in free carrier-wave modulation and realize quick, noise-robust image undersampling. Since our modifications do not impose intricate manufacturing, require long post-processing, nor sacrifice the time-resolving capabilities of THz-spectrometers, their greatest asset, this work has the potential to serve as a foundation for all future single-pixel THz imaging systems.

Item Type: Journal Article
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Submillimeter waves, Terahertz spectroscopy , Imaging systems
Journal or Publication Title: Nature Communications
Publisher: Nature Publishing Group
ISSN: 2041-1723
Official Date: 2020
Dates:
DateEvent
2020Published
21 April 2020Available
22 April 2020Accepted
Volume: 11
Article Number: 2535
DOI: 10.1038/s41467-020-16370-x
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access (Creative Commons)
Date of first compliant deposit: 21 May 2020
Date of first compliant Open Access: 21 May 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/S021442/1EPSRCUNSPECIFIED
14206717Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
14201415 Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
AoE/M-05/12Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
51777023[NSFC] National Natural Science Foundation of Chinahttp://dx.doi.org/10.13039/501100001809
Wolfson Merit AwardRoyal Societyhttp://dx.doi.org/10.13039/501100000288

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