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Photonics
Special Issues
Terahertz Advancements in Fibers, Waveguides and Devices
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Terahertz Advancements in Fibers, Waveguides and Devices

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 30 May 2025 | Viewed by 3047

Special Issue Editors

Prof. Dr. Yifei Zhang

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Guest Editor
School of Integrated Circuits, Shandong University, Jinan, China
Interests: novel 3D integrated circuits; active metasurfaces; smart systems at terahertz frequencies
Special Issues, Collections and Topics in MDPI journals
Dr. Qi Yang

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Guest Editor
College of Electronic Science and Technology, National University of Defense Technology, Changsha, China
Interests: terahertz radar and applications; radar signal processing

Special Issue Information

Dear Colleagues,

We invite you to submit both reviews and original research articles reporting on the recent progress in terahertz (THz) waveguides, circuits, and devices, particularly on fundamentals and application-related scientific investigations—including the recent developments in silicon- and polymer-based devices as well as in components for integrated on-chip THz systems. We plan to cover the various types of THz waveguides, circuits, and antennas (dielectric/metallic) that have been developed recently. Furthermore, we aim to cover the latest advances of their applications in THz communication, radar, imaging, etc.

Your active participation in this Special Issue on “Terahertz Advancements in Fibers, Waveguides and Devices” is very welcome.

Prof. Dr. Yifei Zhang
Dr. Qi Yang
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. Photonics is an international peer-reviewed open access monthly 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 (THz) waveguides
  • THz devices
  • THz communications

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

9 pages, 4292 KiB  
Article
High-Quality-Factor Electromagnetically Induced Transparency in All-Dielectric Metasurfaces Supporting Quasi-Bound States in the Continuum
by Lei Zhang, Zeyang Chu and Suxia Xie
Photonics 2025, 12(3), 291; https://doi.org/10.3390/photonics12030291 - 20 Mar 2025
Viewed by 316
Abstract
Electromagnetically induced transparency based on bound states in the continuum (EIT-BIC) has emerged as a significant research focus in photonics due to its exceptionally high quality factor (Q-factor). This study investigates a periodic dielectric metasurface composed of silicon bar–square ring resonators, [...] Read more.
Electromagnetically induced transparency based on bound states in the continuum (EIT-BIC) has emerged as a significant research focus in photonics due to its exceptionally high quality factor (Q-factor). This study investigates a periodic dielectric metasurface composed of silicon bar–square ring resonators, with a comparative analysis of both monolayer and bilayer configurations. Through systematic examination of transmission spectra, electric field distributions, and Q-factors, we have identified the existence of EIT-BIC and quasi-BIC phenomena in these structures. The experimental results demonstrate distinct characteristics between monolayer and bilayer systems. In the monolayer configuration, a single BIC is observed in the low-frequency region, with its quasi-BIC state generating an EIT window. In contrast, the bilayer structure exhibits dual BICs and dual EIT phenomena in the same spectral range, demonstrating enhanced spectral modulation capabilities. Notably, in the high-frequency region, both configurations maintain a single BIC, with the number remaining independent of structural layer count. The number and spectral positions of BICs can be effectively modulated through variations in incident angle and structural symmetry. In particular, the bilayer configuration demonstrates superior modulation characteristics under oblique incidence conditions, where the quasi-BIC linewidth broadens with increasing incident angle, forming a broader high-Q transparency window. This comparative study between monolayer and bilayer systems not only elucidates the influence of structural layers on BIC characteristics but also provides new insights for flexible spectral control. These findings hold significant implications for artificial linear modulation and play a crucial role in the design of future ultra-high-sensitivity sensors, particularly in optimizing performance through structural layer engineering. Full article
(This article belongs to the Special Issue Terahertz Advancements in Fibers, Waveguides and Devices)
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12 pages, 5259 KiB  
Communication
A Motion Compensation Method for Terahertz SAR Imaging with a Large Squint
by Yuanfeng Li, Qi Yang, Xiaoqiang Hua and Hongqiang Wang
Photonics 2024, 11(12), 1187; https://doi.org/10.3390/photonics11121187 - 18 Dec 2024
Viewed by 648
Abstract
Terahertz-band squint synthetic aperture radars (SARs) can obtain high-resolution images and have application potential in airborne radar systems. However, airborne radars usually have a large squint, which has led to traditional SAR algorithms no longer being applicable to airborne SARs. Additionally, terahertz radar [...] Read more.
Terahertz-band squint synthetic aperture radars (SARs) can obtain high-resolution images and have application potential in airborne radar systems. However, airborne radars usually have a large squint, which has led to traditional SAR algorithms no longer being applicable to airborne SARs. Additionally, terahertz radar imaging systems are more susceptible to the error induced by the platform’s motion. This paper proposes a motion compensation method for terahertz SAR imaging with a large squint angle. First, the signal model of motion compensation is derived, and the processing flow of imaging and motion compensation is detailed. Second, some simulations and experiments are conducted, and the results are reported. The results indicate that the proposed method can effectively correct the motion errors, and the signal model and processing flow are verified. Full article
(This article belongs to the Special Issue Terahertz Advancements in Fibers, Waveguides and Devices)
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18 pages, 9222 KiB  
Article
PTFE-Based Circular Terahertz Dielectric Waveguides
by Hao Li, Dehai Zhang and Haotian Zhu
Photonics 2024, 11(10), 921; https://doi.org/10.3390/photonics11100921 - 29 Sep 2024
Cited by 1 | Viewed by 1516
Abstract
This paper presents the transmission characteristics of flexible solid circular dielectric waveguides in the terahertz frequency band. In this paper, we measured the electrical properties of certain polymers within 325–500 GHz. Through simulation and measurement, the transmission loss, bending loss, and electric field [...] Read more.
This paper presents the transmission characteristics of flexible solid circular dielectric waveguides in the terahertz frequency band. In this paper, we measured the electrical properties of certain polymers within 325–500 GHz. Through simulation and measurement, the transmission loss, bending loss, and electric field distribution of solid-core polymer dielectric waveguides were analyzed and discussed. Additionally, we considered the surrounding cladding of the dielectric waveguide, the signal-feeding mode transmitter, and the interconnection of the dielectric waveguide. Ultimately, in the operating frequency range of 325–500 GHz, we selected PTFE rods with diameters of 0.5 mm and 1 mm as the dielectric waveguides, with measured transmission loss of less than 30 dB/m and 33 dB/m, respectively, and bending loss of less than 1 dB/m. The described dielectric waveguide has engineering significance for short-distance connections in complex geometric environments and provides a reference for subsequent research. Full article
(This article belongs to the Special Issue Terahertz Advancements in Fibers, Waveguides and Devices)
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