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Terahertz Imaging Sensors and Detectors
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Terahertz Imaging Sensors and Detectors

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: closed (15 April 2023) | Viewed by 4667

Special Issue Editors

Dr. Matteo Perenzoni

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Guest Editor
Sony Europe Technology Development Centre, Via Sommarive 18, 38123 Trento, Italy
Interests: image sensors; analog integrated circuits; terahertz and infrared detectors; microelectronics; single photon imaging
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Lucio Pancheri

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Guest Editor
DII, University of Trento, Via Sommarive, 9, 38123 Trento, Italy
Interests: modeling and characterization of electron devices; CMOS integrated photodetectors and image sensors; single-Photon Avalanche Diodes; 3D Imaging; radiation detectors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Progress in sensing and imaging in the terahertz frequency range (0.1-10 THz) has been disruptive in the recent years, with the development of multiple technological solutions for high-performance detectors and focal plane arrays . This special issue covers all recent advances in the detection of terahertz radiation, with a special focus on the use of these detectors for image sensing. Topics include theoretical analysis, modeling of detectors, new sensing techniques, terahertz imagers, camera systems, measurement and experimental setups. Peculiar configurations such as near field THz imaging, SNOM, THz optical coherence tomography, light field imaging, quantum schemes, etc. are of great interest. Review papers providing an overview of the current state-of-the-art of terahertz imaging sensors and detectors are also welcome.

Dr. Matteo Perenzoni
Prof. Dr. Lucio Pancheri
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • terahertz
  • image sensors
  • pixel
  • detector
  • focal plane array
  • detector modeling
  • THz camera
  • antenna-coupled bolometer
  • FET detector
  • Schottky diode
  • time-domain spectroscopy

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Published Papers (2 papers)

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Research

13 pages, 6431 KiB  
Article
Classification of Liquid Ingress in GFRP Honeycomb Based on One-Dimension Sequential Model Using THz-TDS
by Xiaohui Xu, Wenjun Huo, Fei Li and Hongbin Zhou
Sensors 2023, 23(3), 1149; https://doi.org/10.3390/s23031149 - 19 Jan 2023
Cited by 5 | Viewed by 1507
Abstract
Honeycomb structure composites are taking an increasing proportion in aircraft manufacturing because of their high strength-to-weight ratio, good fatigue resistance, and low manufacturing cost. However, the hollow structure is very prone to liquid ingress. Here, we report a fast and automatic classification approach [...] Read more.
Honeycomb structure composites are taking an increasing proportion in aircraft manufacturing because of their high strength-to-weight ratio, good fatigue resistance, and low manufacturing cost. However, the hollow structure is very prone to liquid ingress. Here, we report a fast and automatic classification approach for water, alcohol, and oil filled in glass fiber reinforced polymer (GFRP) honeycomb structures through terahertz time-domain spectroscopy (THz-TDS). We propose an improved one-dimensional convolutional neural network (1D-CNN) model, and compared it with long short-term memory (LSTM) and ordinary 1D-CNN models, which are classification networks based on one dimension sequenced signals. The automated liquid classification results show that the LSTM model has the best performance for the time-domain signals, while the improved 1D-CNN model performed best for the frequency-domain signals. Full article
(This article belongs to the Special Issue Terahertz Imaging Sensors and Detectors)
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12 pages, 9507 KiB  
Article
Fast THz-TDS Reflection Imaging with ECOPS—Point-by-Point versus Line-by-Line Scanning
by Norbert Pałka, Marcin Maciejewski, Kamil Kamiński, Marek Piszczek, Przemysław Zagrajek, Elżbieta Czerwińska, Michał Walczakowski, Krzysztof Dragan, Piotr Synaszko and Waldemar Świderski
Sensors 2022, 22(22), 8813; https://doi.org/10.3390/s22228813 - 15 Nov 2022
Cited by 11 | Viewed by 2453
Abstract
We built a high-speed TDS setup with the use of electronically controlled optical sampling (ECOPS), which can measure up to 1600 terahertz pulses per second. The movement of the sample was provided by two fast-speed motorized linear stages constituting the gantry. We developed [...] Read more.
We built a high-speed TDS setup with the use of electronically controlled optical sampling (ECOPS), which can measure up to 1600 terahertz pulses per second. The movement of the sample was provided by two fast-speed motorized linear stages constituting the gantry. We developed a flat-bar-based metal marker approach for the synchronization of continuous line-by-line scans. We carefully compared the performance of the terahertz reflection time-domain spectroscopy (TDS) scanner operating in a slow point-by-point and a one-hundred-times faster line-by-line imaging scheme. We analyzed images obtained for both schemes for a uniform metallic breadboard with holes, as well as a glass composite sample with defects. Although the measurement time was reduced by 100 times in terms of the line-by-line scheme, the overall performance in both schemes was almost identical in terms of the defects’ sizes, shapes and locations. The results proved that the proposed ECOPS TDS system can provide uniform and extremely fast scanning without any deterioration in image quality. Full article
(This article belongs to the Special Issue Terahertz Imaging Sensors and Detectors)
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