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Applied Sciences
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Recent Advances in the Technologies and Applications of Terahertz Imaging
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Recent Advances in the Technologies and Applications of Terahertz Imaging

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Physics General".

Deadline for manuscript submissions: closed (30 January 2023) | Viewed by 3223

Special Issue Editors

Dr. Jean-Paul Guillet

E-Mail Website
Guest Editor
IMS Laboratory, University of Bordeaux, 3340 Talence, France
Interests: terahertz; millimeter waves; near field; imaging
Special Issues, Collections and Topics in MDPI journals
Dr. Yi Huang

E-Mail Website
Co-Guest Editor
Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
Interests: terahertz imaging; terahertz time-domain spectroscopy; time domain

Special Issue Information

Dear Colleagues,

Terahertz (THz) waves lie between the microwave and infrared bands in the electromagnetic spectrum from 30 μm to 3000 μm. Terahertz spectroscopy and imaging have the characteristics of non-ionization, non-invasiveness, high penetration, high resolution, and spectral fingerprint and have broad application prospects in the non-destructive evaluation of various materials, qualitative and quantitative research in the field of biomedicine, etc.

Despite decades of development, terahertz technology still faces challenges in practical applications. In this context, this Special Issue aims to collect and report the latest developments in terahertz imaging in basic science and practical applications. Reviews and original research articles are very welcome. We look forward to your active participation in this Special Issue.

Dr. Jean-Paul Guillet
Dr. Yi Huang
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. Applied Sciences 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 2400 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 imaging
  • image processing
  • compact THz imaging systems

Published Papers (2 papers)

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Research

11 pages, 6856 KiB  
Communication
Robot Assisted THz Imaging with a Time Domain Spectrometer
by Dominik Bachmann, Rolf Brönnimann, Luis Nicklaus Caceres, Sofie L. Gnannt, Erwin Hack, Elena Mavrona, Daniel Sacré and Peter Zolliker
Appl. Sci. 2023, 13(4), 2747; https://doi.org/10.3390/app13042747 - 20 Feb 2023
Viewed by 1432
Abstract
THz-Time domain spectroscopic imaging is demonstrated combining a robotic scanning method with continuous signal acquisition and holographic reconstruction of the object to improve the imaging resolution. We apply the method to a metallic Siemens star in order to quantify resolution and to wood [...] Read more.
THz-Time domain spectroscopic imaging is demonstrated combining a robotic scanning method with continuous signal acquisition and holographic reconstruction of the object to improve the imaging resolution. We apply the method to a metallic Siemens star in order to quantify resolution and to wood samples to demonstrate the technique on a non-metallic object with an unknown structure. Full article
(This article belongs to the Special Issue Recent Advances in the Technologies and Applications of Terahertz Imaging)
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11 pages, 3223 KiB  
Article
Full-Field Super-Resolution Terahertz Imaging Based on Rotating Coherent Scattering Microscopy
by Duoxuan Ma, Jie Zhao, Dayong Wang, Hao Lin, Lu Rong, Yunxin Wang and Shufeng Lin
Appl. Sci. 2023, 13(2), 982; https://doi.org/10.3390/app13020982 - 11 Jan 2023
Cited by 1 | Viewed by 1429
Abstract
For decades, terahertz (THz) microscopic imaging has been limited by the resolution of the system due to the larger wavelength, the power of the source, and the equivalent noise power of the detector, so a lot of research has focused on single-point scanning [...] Read more.
For decades, terahertz (THz) microscopic imaging has been limited by the resolution of the system due to the larger wavelength, the power of the source, and the equivalent noise power of the detector, so a lot of research has focused on single-point scanning imaging. With the development of hardware, full-field THz imaging based on high-power continuous-wave THz sources have been developed such as the direct intensity imaging method and lensless coherent imaging. In particular, the THz direct intensity imaging method requires no complicated computational reconstruction, while the high resolution, as a key issue, still needs to be improved. In this paper, the rotating coherent scattering microscopy was applied to THz imaging for the first time. Here, we designed and fabricated a hemisphere lens with high-resistance silicon. The tilted hemisphere lens transformed the incident divergent beam into a plane wave, and the total internal reflection occurred in the planar surface within the hemispherical lens, and generated evanescent waves in the rare medium. At the same time, the sample was placed very close to the plane of the hemispherical lens, so that the sample was illuminated by the evanescent waves. The scattered waves carried high frequency information to the far field, and thus through an objective, the super-resolution imaging was achieved along a single direction. Then, the hemispherical lens was rotated to obtain coherent scattering microscopic images under different evanescent wave illumination angles. Finally, the full-field super-resolution imaging results were obtained through incoherent superposition. Full article
(This article belongs to the Special Issue Recent Advances in the Technologies and Applications of Terahertz Imaging)
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