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Photonics
Special Issues
Terahertz Metamaterials and Device Applications
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Terahertz Metamaterials and Device Applications

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

Deadline for manuscript submissions: closed (30 April 2023) | Viewed by 12869

Special Issue Editors

Dr. Xiangjun Li

E-Mail Website
Guest Editor
College of Information Engineering, China Jiliang University, Hangzhou 310018, China
Interests: terahertz metamaterials; terahertz wave sensing
Dr. Dexian Yan

E-Mail Website
Guest Editor
College of Information Engineering, China Jiliang University, No. 258 Xueyuan Street, Xiasha Higher Education Zone, Hangzhou 310018, China
Interests: terahertz devices; terahertz radiation source
Special Issues, Collections and Topics in MDPI journals
Dr. Xufeng Jing

E-Mail Website
Guest Editor
Institute of Optoelectronic Technology, China Jiliang University, Hangzhou 310018, China
Interests: optoelectronic materials and devices; metamaterials; metasurfaces
Special Issues, Collections and Topics in MDPI journals
Dr. Jining Li

E-Mail Website
Guest Editor
School of Precision Instrument and Opto-Electronics Engineering, Tianjin University, Tianjin University, Room C211, Building No.26, 92 Weijin Road, Nankai District, Tianjin 300072, China
Interests: terahertz biosensor; terahertz imaging
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Terahertz science and technology, defined as the frequency range of 0.1–10 THz, has attracted a great deal of interest, due to its potential applications. The metamaterial is an artificial material with a subwavelength thickness. The metamaterial can realize flexible and effective modulation of terahertz wave polarization, amplitude, phase, and other characteristics. Moreover, the metamaterial can realize the functions of sensing, beam deflection, superlens, vortex beam generation, encoding, stealth, and many other applications.

This Special Issue invites manuscripts that document the recent advances in “Terahertz Metamaterials and Device Applications”. We are pleased to invite you submit your manuscript discussing theory, experimental results as well as applications in terahertz range.

This Special Issue aims at highlighting the recent progress and trends in terahertz metamaterial and related device applications. In this Special Issue, original research articles and reviews are welcome. We will consider theoretical, numerical, and experimental papers that cover, but are not limited to, these topics:

  • Advanced in THz metamaterial;
  • Terahertz photonic metasurfaces;
  • Advanced functional materials for THz metamaterial devices;
  • Polarization conversion metamaterial;
  • Absorption metamaterial;
  • Metamaterial sensors;
  • Electromagnetic coded metamaterials;
  • Vector light field metamaterials;
  • Recent uses of THz metamaterial in industry or advanced laboratories.

We look forward to receiving your contributions.

Dr. Xiangjun Li
Dr. Dexian Yan
Dr. Xufeng Jing
Dr. Jining Li
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.

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

Published Papers (5 papers)

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Research

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15 pages, 4701 KiB  
Article
High-Sensitivity Sensor Based on Diametrical Graphene Strip Plasma-Induced Transparency
by Aijun Zhu, Pengcheng Bu, Lei Cheng, Cong Hu and Rabi Mahapatra
Photonics 2023, 10(7), 830; https://doi.org/10.3390/photonics10070830 - 17 Jul 2023
Cited by 11 | Viewed by 1510
Abstract
In this paper, two parallel graphene strip structures are adopted to achieve tunable plasma-induced transparency (PIT) sensors in the terahertz band. Both graphene bands act as bright modes, and a PIT window appears due to the weak hybridization between them. A Lorentzian oscillation [...] Read more.
In this paper, two parallel graphene strip structures are adopted to achieve tunable plasma-induced transparency (PIT) sensors in the terahertz band. Both graphene bands act as bright modes, and a PIT window appears due to the weak hybridization between them. A Lorentzian oscillation coupling model is fitted to the simulation results of the proposed structure by the finite-difference time-domain (FDTD) method and is in good agreement with the simulation results. The performance of the PIT system can be controlled by tuning the geometrical parameters of the structure. In addition, the resonant frequency of the PIT window can be dynamically adjusted by changing the chemical potential and carrier mobility of the graphene strips. When the chemical potential of graphene increases from 0.2 eV to 1 eV, the amplitude modulation depth of the PIT window (2.832 THz, 3.684 THz, and 4.386 THz) can reach 92.39%, 96.14%, and 90.4%, respectively. Furthermore, due to its dispersion characteristics, the realized PIT window has a sensitive response to the surrounding medium, and the sensitivity can be as high as 1.25 THz/RIU. This PIT effect-based graphene microstructure has important implications for the future design of terahertz modulators, optical switches, and ultrasensitive sensors. Full article
(This article belongs to the Special Issue Terahertz Metamaterials and Device Applications)
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10 pages, 4224 KiB  
Communication
Single-Layered Phase-Change Metasurfaces Achieving Polarization- and Crystallinity-Dependent Wavefront Manipulation
by Jie Hu, Yujie Chen, Wenting Zhang, Ziyi Tang, Xiang Lan, Qinrong Deng, Hengyu Cui, Ling Li and Yijia Huang
Photonics 2023, 10(3), 344; https://doi.org/10.3390/photonics10030344 - 22 Mar 2023
Cited by 1 | Viewed by 1715
Abstract
As a promising platform for versatile electromagnetic (EM) manipulations, metasurfaces have drawn wide interest in recent years due to their unique EM properties and small footprints. However, although great efforts have been made to achieve multifunctionalities, the design of tunable metasurfaces with high [...] Read more.
As a promising platform for versatile electromagnetic (EM) manipulations, metasurfaces have drawn wide interest in recent years due to their unique EM properties and small footprints. However, although great efforts have been made to achieve multifunctionalities, the design of tunable metasurfaces with high compactness is still challenging. Here, a simple yet powerful design methodology for single-layered reconfigurable metasurfaces composed of nonvolatile phase-change material Ge2Sb2Se4Te1 (GSST) is proposed with average working amplitudes of 72.6% and 53% at different crystallization levels. The proposed metasurfaces could not only enable independent phase control at different crystallization levels but also introduced another polarization degree of freedom. As a proof of concept, we numerically demonstrate three kinds of metadevices in the infrared region achieving a multi-focus metalens with tunable foci, multistate vortex beam generator with adjustable topological charges and multi-channel meta-hologram with three independent information channels. It is believed that these multifunctional metasurfaces with both tunability and compactness are promising for various applications including information encryption, chiroptical spectroscopy, chiral imaging and wireless communication. Full article
(This article belongs to the Special Issue Terahertz Metamaterials and Device Applications)
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9 pages, 2325 KiB  
Communication
An Electrically Tunable Terahertz Filter Based on Liquid-Crystal-Filled Slits with Wall Corrugations
by Shi-Yang Zhang, Jing Ma, Hai-Ling He, Cheng-Guo Tong, Huan Liu, Ya-Xian Fan and Zhi-Yong Tao
Photonics 2022, 9(12), 894; https://doi.org/10.3390/photonics9120894 - 23 Nov 2022
Cited by 2 | Viewed by 1462
Abstract
We propose a type of hollow planar waveguide with corrugated walls, which can realize electrically tunable terahertz (THz) filtering by filling the slit with liquid crystals. When the THz signals propagate in a planar waveguide with periodic corrugations, the transmission spectrum always exhibits [...] Read more.
We propose a type of hollow planar waveguide with corrugated walls, which can realize electrically tunable terahertz (THz) filtering by filling the slit with liquid crystals. When the THz signals propagate in a planar waveguide with periodic corrugations, the transmission spectrum always exhibits many pass and stop bands. Inserting a section of defects in the middle of the periodic corrugations can excite an extremely narrow transmission peak, which would be a very good THz filter for frequency division. To achieve tunability of this narrow linewidth THz filter, we also fill the slit between the two corrugated walls with a nematic liquid crystal. The effective refractive index of liquid crystals will change with the external electric field, thus tuning the frequency of the narrow peak. The simulated results show that the center frequency of the proposed filter can be tuned linearly in the frequency range of 0.984~1.023 THz by the external electric field. Moreover, the bandwidth of the filter can be adjusted from 3.2 GHz to 0.3 GHz by increasing the number of periods in the waveguide, and a maximum Q value of 2556 can be achieved when the number of periods at both sides of the defect is 12. Full article
(This article belongs to the Special Issue Terahertz Metamaterials and Device Applications)
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9 pages, 3291 KiB  
Article
Enhancing the Terahertz Absorption Spectrum Based on the Low Refractive Index All-Dielectric Metasurface
by Pingan Liu, Wenping Li, Naichang Chen, Chan Ma, Xiangjun Li and Dexian Yan
Photonics 2022, 9(11), 848; https://doi.org/10.3390/photonics9110848 - 10 Nov 2022
Cited by 5 | Viewed by 1859
Abstract
We presented an angle-multiplexing low refractive index dielectric metasurface for terahertz absorption spectrum enhancement of lactose with high Q resonance properties. The unit cell structure of the acrylonitrile butadiene styrene (ABS) square structure is designed and optimized. The resonant peak shifts of the [...] Read more.
We presented an angle-multiplexing low refractive index dielectric metasurface for terahertz absorption spectrum enhancement of lactose with high Q resonance properties. The unit cell structure of the acrylonitrile butadiene styrene (ABS) square structure is designed and optimized. The resonant peak shifts of the dielectric metasurface are analyzed by changing the incident angle of the terahertz wave. Then the α-lactose films with different thicknesses are added to investigate the enhancement effect. The resonant peak amplitude of the angle-multiplexing low refractive index dielectric metasurface absorption spectrum changes greatly with the absorption spectrum of the samples. The results illustrate that the enhanced absorption spectrum formed by the linked envelope can be up to 45 times stronger than that without the unit cell structures and also exhibits a high-quality factor. The proposed dielectric metasurface provides great potential in enhancing the terahertz absorption spectrum. Full article
(This article belongs to the Special Issue Terahertz Metamaterials and Device Applications)
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Review

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27 pages, 4866 KiB  
Review
A Review: The Functional Materials-Assisted Terahertz Metamaterial Absorbers and Polarization Converters
by Dexian Yan, Yi Wang, Yu Qiu, Qinyin Feng, Xiangjun Li, Jining Li, Guohua Qiu and Jiusheng Li
Photonics 2022, 9(5), 335; https://doi.org/10.3390/photonics9050335 - 11 May 2022
Cited by 28 | Viewed by 5532
Abstract
When metamaterial structures meet functional materials, what will happen? The recent rise of the combination of metamaterial structures and functional materials opens new opportunities for dynamic manipulation of terahertz wave. The optical responses of functional materials are greatly improved based on the highly-localized [...] Read more.
When metamaterial structures meet functional materials, what will happen? The recent rise of the combination of metamaterial structures and functional materials opens new opportunities for dynamic manipulation of terahertz wave. The optical responses of functional materials are greatly improved based on the highly-localized structures in metamaterials, and the properties of metamaterials can in turn be manipulated in a wide dynamic range based on the external stimulation. In the topical review, we summarize the recent progress of the functional materials-based metamaterial structures for flexible control of the terahertz absorption and polarization conversion. The reviewed devices include but are not limited to terahertz metamaterial absorbers with different characteristics, polarization converters, wave plates, and so on. We review the dynamical tunable metamaterial structures based on the combination with functional materials such as graphene, vanadium dioxide (VO2) and Dirac semimetal (DSM) under various external stimulation. The faced challenges and future prospects of the related researches will also be discussed in the end. Full article
(This article belongs to the Special Issue Terahertz Metamaterials and Device Applications)
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