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Advances in Terahertz Metasurfaces
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Advances in Terahertz Metasurfaces

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (10 August 2023) | Viewed by 3433

Special Issue Editor

Dr. Jitao Li

E-Mail Website
Guest Editor
School of Precision Instruments and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
Interests: perovskite; optoelectronic materials and devices; energy materials and devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Terahertz (THz) waves have broad application prospects in 6G communication, space exploration, nondestructive testing, biological analysis, and other fields. THz metasurfaces are periodic microstructure devices that control the time–space characteristics of THz waves at the sub-wavelength scale. They provide a wealth of manipulation dimensions and can manipulate almost all physical properties of THz waves, such as frequency, phase, amplitude, polarization, spin angular momentum (SAM), and orbital angular momentum (OAM). THz metasurfaces can not only manipulate any single physical attribute of THz wave but also multiple physical attributes synchronously, so they show lots of newfangled, very attractive performances that traditional quasi-optical elements do not have. This Special Issue aims to discuss the latest progress in THz metasurfaces, covering advanced applications, advanced design technologies, advanced micro–nano manufacturing technologies, and advanced characterization technologies of THz metasurfaces, as well as various fundamental physics for interaction of THz and matesurfaces. Research and review papers will be welcomed.

Dr. Jitao Li
Guest Editor

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. Materials 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 2600 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 metasurfaces
  • fundamental physics
  • advanced applications
  • advanced design
  • terahertz characterization
  • micro–nano manufacturing

Published Papers (2 papers)

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Research

10 pages, 4072 KiB  
Article
A Tunable Terahertz Absorber Based on Double-Layer Patterned Graphene Metamaterials
by Xin Tang, Haoduo Jia, Luyang Liu, Ming Li, Dai Wu, Kui Zhou, Peng Li, Langyu Tian, Dingyu Yang and Weijun Wang
Materials 2023, 16(11), 4166; https://doi.org/10.3390/ma16114166 - 02 Jun 2023
Cited by 2 | Viewed by 1183
Abstract
Graphene is widely used in tunable photonic devices due to its numerous exotic and exceptional properties that are not found in conventional materials, such as high electron mobility, ultra-thin width, ease of integration and good tunability. In this paper, we propose a terahertz [...] Read more.
Graphene is widely used in tunable photonic devices due to its numerous exotic and exceptional properties that are not found in conventional materials, such as high electron mobility, ultra-thin width, ease of integration and good tunability. In this paper, we propose a terahertz metamaterial absorber that is based on patterned graphene, which consists of stacked graphene disk layers, open ring graphene pattern layers and metal bottom layers, all separated by insulating dielectric layers. Simulation results showed that the designed absorber achieved almost perfect broadband absorption at 0.53–1.50 THz and exhibited polarization-insensitive and angle-insensitive characteristics. In addition, the absorption characteristics of the absorber can be adjusted by changing the Fermi energy of graphene and the geometrical parameters of the structure. The above results indicate that the designed absorber can be applied to photodetectors, photosensors and optoelectronic devices. Full article
(This article belongs to the Special Issue Advances in Terahertz Metasurfaces)
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13 pages, 3949 KiB  
Article
Theoretical Study on All-Dielectric Elliptic Cross Metasurface Sensor Governed by Bound States in the Continuum
by Haocheng Cai, Xiaoxu Yu and Luhong Mao
Materials 2023, 16(5), 2113; https://doi.org/10.3390/ma16052113 - 06 Mar 2023
Viewed by 1787
Abstract
The appearance of all-dielectric micro–nano photonic devices constructed from high refractive index dielectric materials offers a low-loss platform for the manipulation of electromagnetic waves. The manipulation of electromagnetic waves by all-dielectric metasurfaces reveals unprecedented potential, such as focusing electromagnetic waves and generating structured [...] Read more.
The appearance of all-dielectric micro–nano photonic devices constructed from high refractive index dielectric materials offers a low-loss platform for the manipulation of electromagnetic waves. The manipulation of electromagnetic waves by all-dielectric metasurfaces reveals unprecedented potential, such as focusing electromagnetic waves and generating structured light. Recent advances in dielectric metasurfaces are associated with bound states in the continuum, which can be described as non-radiative eigen modes above the light cone supported by metasurfaces. Here, we propose an all-dielectric metasurface composed of elliptic cross pillars arranged periodically and verify that the displacement distance of a single elliptic pillar can control the strength of the light–matter interaction. Specifically, when the elliptic cross pillar is C4 symmetric, the quality factor of the metasurface at the Γ point is infinite, also called the bound states in the continuum. Once the C4 symmetry is broken by moving a single elliptic pillar, the corresponding metasurface engenders mode leakage; however, the large quality factor still exists, which is called the quasi-bound states in the continuum. Then, it is verified by simulation that the designed metasurface is sensitive to the refractive index change of the surrounding medium, indicating that it can be applied for refractive index sensing. Moreover, combined with the specific frequency and the refractive index variation of the medium around the metasurface, the information encryption transmission can be realized effectively. Therefore, we envisage that the designed all-dielectric elliptic cross metasurface can promote the development of miniaturized photon sensors and information encoders due to its sensitivity. Full article
(This article belongs to the Special Issue Advances in Terahertz Metasurfaces)
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