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Photonics
Special Issues
Terahertz Transmission and Imaging
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Terahertz Transmission and Imaging

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

Deadline for manuscript submissions: 30 April 2024 | Viewed by 4804

Special Issue Editors

Dr. Cheng Gong

E-Mail Website
Guest Editor
Institute of Modern Optics, Nankai University, Tianjin 300350, China
Interests: terahertz and infrared imaging; metamaterials; MEMS; waveguides; nondestructive testing
Prof. Dr. Chengbin Jing

E-Mail Website
Guest Editor
School of Physics and Electronic Science, East China Normal University, Shanghai 200062, China
Interests: terahertz transmission; terahertz waveguide; terahertz imaging; infrared optical material; middle and far infrared optical fiber
Dr. Zhigang Wang

E-Mail Website
Guest Editor
School of Electronic Engineering, University of Electronic Science and Technology, Chengdu 611731, China
Interests: microsystems; waveguides; metamaterials; terahertz sources; detectors

Special Issue Information

Dear Colleagues,

Terahertz (THz) is located between infrared and microwave in the electromagnetic spectrum, and the frequency range is 0.1 THz to 10 THz. It is considered to be the core frequency band of 6G communication in the future because it has super-bandwidth spectrum resources that can be utilized to support super-high-speed transmission and communication. The quantum energy of terahertz waves is very low and does not ionize biological tissues, so there is no harmful radiation, and it has good biological safety. In addition, terahertz waves have very good penetrability to most non-polar materials (plastics, ceramics, porous fibers, cloth, wood, etc.) and have unique reflection as well as transmission characteristics to metals, semiconductors, and other materials. Therefore, terahertz-based imaging is recognized as an important technology of nondestructive testing in the future.

However, due to the large loss of terahertz in the air and the lack of high-performance terahertz transmission as well as control devices, the application of terahertz transmission and communication is limited. Moreover, due to the long wavelength of terahertz, it is easy to be affected by diffraction during the imaging process, resulting in a low resolution. Additionally, the lack of high-performance THz detection and control devices also limits the application of THz imaging in high-precision nondestructive testing. Therefore, this Special Issue focuses on new devices, methods, and systems of terahertz transmission as well as imaging. We welcome fundamental research, advanced technologies, and innovative applications in the form of theories, simulations, or experiments. Manuscripts will include, but not be limited to, the following topics:

  • Terahertz transmission devices, methods, and systems;
  • Terahertz imaging devices, methods, and systems.

Dr. Cheng Gong
Prof. Dr. Chengbin Jing
Dr. Zhigang Wang
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 transmission
  • terahertz imaging
  • THz devices
  • THz materials

Published Papers (4 papers)

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Research

10 pages, 2495 KiB  
Article
Enhanced Bolometric Detection of THz Signals by a Resonant Structure for Inclined Radiation Incidence
by Polina Nikiforova, Anna Bogatskaya and Alexander Popov
Photonics 2024, 11(1), 42; https://0-doi-org.brum.beds.ac.uk/10.3390/photonics11010042 - 31 Dec 2023
Viewed by 865
Abstract
In this work, we consider the possibility of enhancing terahertz bolometric detection efficiency using resonant structures in the case of an inclined incidence of radiation. The structures are made of a sequence of doped and undoped semiconductors, including epsilon-near-zero areas. Undoped regions act [...] Read more.
In this work, we consider the possibility of enhancing terahertz bolometric detection efficiency using resonant structures in the case of an inclined incidence of radiation. The structures are made of a sequence of doped and undoped semiconductors, including epsilon-near-zero areas. Undoped regions act as electromagnetic resonators, thus ensuring resonant signal penetration through the opaque (doped) regions of the structure. A set of epsilon-near-zero areas can ensure substantial enhancements to the electric field in the material. In the doped regions, absorption occurs. The structure described above can provide efficient resonant energy absorption for a wide range of angles of incidence. The numerical calculations based on the solution of the Helmholtz equation have shown that the studied resonant structures ensure the absorption of up to 50% of the incident radiation energy for a 60-degree incidence. Full article
(This article belongs to the Special Issue Terahertz Transmission and Imaging)
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14 pages, 3472 KiB  
Article
Stacked Chip-Based Terahertz Metamaterials and Their Application
by Han Wang, Zhigang Wang, Bo Yan, Xinyu Li, Chenrui Zhang, Huiqi Jiang, Minghui Deng, Lesiqi Yin and Cheng Gong
Photonics 2023, 10(11), 1226; https://0-doi-org.brum.beds.ac.uk/10.3390/photonics10111226 - 01 Nov 2023
Viewed by 872
Abstract
A terahertz (THz) metamaterial design mechanism based on a stacked chip is proposed. Unlike the traditional sandwich-type metamaterial design mechanism based on the “resonant layer–dielectric layer–ground layer” structure, it adopts a stacked design of upper and lower metamaterial chips to achieve a new [...] Read more.
A terahertz (THz) metamaterial design mechanism based on a stacked chip is proposed. Unlike the traditional sandwich-type metamaterial design mechanism based on the “resonant layer–dielectric layer–ground layer” structure, it adopts a stacked design of upper and lower metamaterial chips to achieve a new structure based on the “dielectric layer–resonant layer–air layer–ground layer” structure. This could break through the thickness limitations and construct an ultra-thin metamaterial upper chip. To verify the effectiveness of this method, we applied it to the field of THz perfect absorbers. We designed, simulated, and prepared a terahertz stacked chip-based perfect absorber with an upper-chip thickness less than 1/800 of the wavelength. Then, a reflective spectroscopy system based on a vector network analyzer is built to test the absorption performance. The measured results show that it has an absorptivity of 98.4% at 0.222 THz, which is in good agreement with simulations. Full article
(This article belongs to the Special Issue Terahertz Transmission and Imaging)
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17 pages, 6221 KiB  
Communication
A High-Sensitivity Fiber Biosensor Based on PVDF-Excited Surface Plasmon Resonance in the Terahertz Band
by Yani Zhang, Yiming Yao, Zhe Guang, Jia Xue, Qiuyang Wang, Jiaqin Gong, Zohaib Ali and Zhongtian Yang
Photonics 2023, 10(10), 1159; https://0-doi-org.brum.beds.ac.uk/10.3390/photonics10101159 - 16 Oct 2023
Viewed by 1066
Abstract
In this paper, a D-type photonic crystal fiber (PCF) with Zeonex material as the substrate and polyvinylidene fluoride (PVDF) material as the surface plasmon resonance (SPR) excitation layer is proposed for biosensing in the terahertz (THz) band. Analyzed with a finite element method, [...] Read more.
In this paper, a D-type photonic crystal fiber (PCF) with Zeonex material as the substrate and polyvinylidene fluoride (PVDF) material as the surface plasmon resonance (SPR) excitation layer is proposed for biosensing in the terahertz (THz) band. Analyzed with a finite element method, the proposed biosensor has shown excellent sensing properties for analyte refractive indices ranging from 1.32 to 1.45. With a maximum sensor resolution of 8.40 × 10−7 refractive index unit (RIU) and a figure of merit of 39.42 RIU−1, the maximum wavelength sensitivity and amplitude sensitivity can reach 335.00 μm/RIU and −66.01 RIU−1, respectively. A ±2% fabrication tolerance analysis is also performed on the biosensor to prove its practical feasibility. We conclude that our proposed PCF biosensor utilizing PVDF-excited SPR can provide high sensitivity, and thus a compact, label-free, and convenient solution for biomedical liquid sensing in the THz band. Full article
(This article belongs to the Special Issue Terahertz Transmission and Imaging)
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16 pages, 9910 KiB  
Article
Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation
by Bo Yu, Jie Yang, Yexi Song, Zhigang Wang, Tiedi Zhang, Bo Yan and Ruimin Xu
Photonics 2023, 10(7), 816; https://0-doi-org.brum.beds.ac.uk/10.3390/photonics10070816 - 13 Jul 2023
Cited by 4 | Viewed by 1276
Abstract
In terahertz communication systems, amplifiers and other components can induce non-linear distortion in terms of amplitude and phase, resulting in system performance degradation. This paper presents a terahertz metamaterial waveguide to mitigate amplitude and phase distortions in some terahertz systems. A simple method [...] Read more.
In terahertz communication systems, amplifiers and other components can induce non-linear distortion in terms of amplitude and phase, resulting in system performance degradation. This paper presents a terahertz metamaterial waveguide to mitigate amplitude and phase distortions in some terahertz systems. A simple method based on free-space analysis is proposed for designing metamaterial waveguides in an enclosed space. The quasi-periodic metamaterial structures, which feature I-shaped resonant patterns, are integrated onto the inner walls of rectangular waveguides. The phase and amplitude of electromagnetic waves within the waveguide can be modulated by varying the dimensions and number of these resonators. Utilizing the effective medium theory and the equivalent circuits, the metamaterial waveguide’s phase and absorption modulation mechanisms are analyzed. Based on the proposed structure, a metamaterial waveguide with I-shaped resonators is designed and fabricated, and its abilities to modulate the phase and absorption of terahertz waves around 0.2 THz are demonstrated. Full article
(This article belongs to the Special Issue Terahertz Transmission and Imaging)
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