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Terahertz Technologies and Applications
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Terahertz Technologies and Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: 30 April 2025 | Viewed by 7775

Special Issue Editors

Dr. Liming Si

E-Mail Website
Guest Editor
School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China
Interests: terahertz; metasurface; metamaterials; antennas; radar
Special Issues, Collections and Topics in MDPI journals
Dr. Xiue Bao

E-Mail Website
Guest Editor
School of Integrated Circuits and Electronics, Beijing Institute of Technology, Beijing 100081, China
Interests: microwave biomedical and material applications; broadband dielectric spectroscopy characterization; microwave-microfluidic devices; flexible microwave devices; RF, microwave, and millimeter-wave calibration technologies
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We are inviting submissions to the Special Issue on Terahertz Technologies and Applications. Terahertz waves, typically referring to frequencies from 0.1 THz to 10 THz, have several potential advances in various applications, including 6G communications, security, biomedical sensing, and imaging. To satisfy their use in real applications, many new technologies and applications have been introduced in this field.

This Special Issue brings recent advanced subjects into focus, involving new  materials, theoretical analysis, designs, devices, fabrication techniques, calibration technologies, and various applications of the terahertz waves.

Dr. Liming Si
Dr. Xiue Bao
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

  • THz sources
  • THz detectors
  • THz plasmonics
  • THz metamaterials
  • THz devices
  • THz systems
  • THz measurements
  • THz sensors
  • THz imaging
  • THz radar
  • THz wireless communication
  • THz wireless power transfer

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Related Special Issue

Published Papers (4 papers)

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Research

12 pages, 1153 KiB  
Article
Performance of a High-Speed Pyroelectric Receiver as Cryogen-Free Detector for Terahertz Absorption Spectroscopy Measurements
by Jente R. Wubs, Uwe Macherius, Xiang Lü, Lutz Schrottke, Matthias Budden, Johannes Kunsch, Klaus-Dieter Weltmann and Jean-Pierre H. van Helden
Appl. Sci. 2024, 14(10), 3967; https://doi.org/10.3390/app14103967 - 7 May 2024
Cited by 3 | Viewed by 1414
Abstract
The application of terahertz (THz) radiation in scientific research as well as in applied and commercial technology has expanded rapidly in recent years. One example is the progress in high-resolution THz spectroscopy based on quantum cascade lasers, which has enabled new observations in [...] Read more.
The application of terahertz (THz) radiation in scientific research as well as in applied and commercial technology has expanded rapidly in recent years. One example is the progress in high-resolution THz spectroscopy based on quantum cascade lasers, which has enabled new observations in astronomy, atmospheric research, and plasma diagnostics. However, the lack of easy-to-use and miniaturised detectors has hampered the development of compact THz spectroscopy systems out of the laboratory environment. In this paper, we introduce a new high-speed pyroelectric receiver as a cryogen-free detector for THz absorption spectroscopy. Its performance is characterised by absorption spectroscopy measurements on a reference gas cell (RGC) with ammonia using a tunable THz quantum cascade laser at approximately 4.75 THz as the light source. It is shown that the receiver can record spectra up to 281 Hz without any artefacts to the observed spectral absorption profile, and the results reproduce the known pressure of ammonia in the RGC. This demonstrates that the pyroelectric receiver can be reliably used as an alternative to helium-cooled bolometers for absorption spectroscopy measurements in the THz range, with its main advantages being the high bandwidth, compactness, relatively low cost, and room-temperature operation. Its simplicity and high sensitivity make this receiver a key component for compact THz spectroscopy systems. Full article
(This article belongs to the Special Issue Terahertz Technologies and Applications)
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12 pages, 3212 KiB  
Article
High-Aspect-Ratio Silicon Metasurfaces: Design, Fabrication, and Characterization
by Yao Yao, Zhuo Wang, Zhiyan Zhu, Yu He, Shulin Sun, Lei Zhou and Qiong He
Appl. Sci. 2023, 13(17), 9607; https://doi.org/10.3390/app13179607 - 24 Aug 2023
Cited by 1 | Viewed by 2770
Abstract
Unrestricted manipulations on terahertz (THz) waves are highly desired in integration-optics, but THz devices based on conventional materials are usually bulky in size. Although all-silicon metasurfaces have exhibited great capabilities in manipulating THz waves, most of them are less efficient and have limited [...] Read more.
Unrestricted manipulations on terahertz (THz) waves are highly desired in integration-optics, but THz devices based on conventional materials are usually bulky in size. Although all-silicon metasurfaces have exhibited great capabilities in manipulating THz waves, most of them are less efficient and have limited functionalities. In this work, we first design a silicon meta-atom structure consisting of a high-aspect-ratio (AR) micro-pillar that exhibits nearly perfect transmission and large transmission phase of THz wave, and systemically study how the fabrication quality (e.g., steepness of the sidewall and the vertical thickness distribution) may influence the final performance of a functional metasurface constructed with such meta-atoms. After experimentally examining how two working phases in the deep-reactive-ion-etch technology (i.e., the etch and passivation phases) influence the quality of the fabricated meta-devices, we develop an optimized Bosch process to realize high-AR (~20:1) all-silicon metasurfaces by balancing two working phases. We finally design/fabricate a high-AR silicon metasurface and experimentally demonstrate that it behaves as a high-efficiency half-wave-plate for THz waves in transmission geometry. Our results pave the avenue to realize ultra-compact THz meta-devices with high performance in transmission geometry, which is highly desirable for THz applications. Full article
(This article belongs to the Special Issue Terahertz Technologies and Applications)
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18 pages, 6106 KiB  
Article
Obtaining the Effective Dielectric Permittivity of a Conducting Surface in the Terahertz Range via the Characteristics of Surface Plasmon Polaritons
by Vasily Valerievich Gerasimov, Alexey Konstantinovich Nikitin, Alexey Georgievich Lemzyakov, Ivan Aleksandrovich Azarov and Igor Aleksandrovich Kotelnikov
Appl. Sci. 2023, 13(13), 7898; https://doi.org/10.3390/app13137898 - 5 Jul 2023
Cited by 4 | Viewed by 1502
Abstract
With the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In this [...] Read more.
With the intensive development of data transmitting and processing devices in the terahertz (THz) frequency range, an important part of which are integrated plasmonic components and communication lines, it becomes necessary to measure correctly the optical constants of their conductive surfaces. In this paper, we describe a reliable method for determining the effective permittivity εm of a metal surface from the measured characteristics (refractive and absorption indices) of THz surface plasmon polaritons (SPPs). The novelty of the method is the conduction of measurements on a metal surface with a dielectric layer of subwavelength thickness, suppressing the radiative losses of SPPs, which are not taken into account by the SPP dispersion equation. The method is tested on a number of flat “gold sputtering–zinc sulfide layer–air” structures with the use of the THz radiation (λ0 = 141 μm) from the Novosibirsk free electron laser (NovoFEL). The SPP characteristics are determined from interferograms measured with a plasmon Michelson interferometer. It is found that the method allows a significant increase in the accuracy of the εm in comparison with measurements on the same metal surface without a dielectric layer. Full article
(This article belongs to the Special Issue Terahertz Technologies and Applications)
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15 pages, 10444 KiB  
Article
Remote Spectral Identification in the THz Band with Reflection Spectroscopy in an Open Atmosphere
by Michał Walczakowski, Marcin Maciejewski and Norbert Pałka
Appl. Sci. 2023, 13(13), 7788; https://doi.org/10.3390/app13137788 - 1 Jul 2023
Cited by 1 | Viewed by 1149
Abstract
Spectroscopy in the terahertz (THz) band has been discussed as a promising tool for identifying substances such as mold in food, narcotics, or explosive materials. Other than the technological limitations, the most important difficulty is the presence of water vapor in the atmosphere, [...] Read more.
Spectroscopy in the terahertz (THz) band has been discussed as a promising tool for identifying substances such as mold in food, narcotics, or explosive materials. Other than the technological limitations, the most important difficulty is the presence of water vapor in the atmosphere, which affects THz measurements. In this paper, we present a systematic approach to the challenging subject of remote identification. We start with a brief analysis of the technical capabilities of the THz components and report the choice of devices for designing an experimental setup for reflection spectroscopy. We follow with the presentation of the transmission THz spectrometer working in an open atmosphere. Research conducted on the transmission configuration provides findings that are implemented in the experimental setup working in a reflective configuration. The final phase is an experiment providing data measured in the reflection configuration with the presence of water vapor, allowing the use of spectra in the identification of the measured samples. Full article
(This article belongs to the Special Issue Terahertz Technologies and Applications)
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