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Symmetry
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Advances in Metamaterial and Symmetry/Asymmetry
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Advances in Metamaterial and Symmetry/Asymmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (10 April 2023) | Viewed by 5952

Special Issue Editors

Dr. Ben-Xin Wang

E-Mail Website
Guest Editor
School of Science, Jiangnan University, Wuxi 214122, China
Interests: metamaterials; metasurface; terahertz photonics; graphene plasmonics
Dr. Han Xiong

E-Mail Website
Guest Editor
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
Interests: metamaterials; metasurfaces; energy absorption and conversion; wireless transmitting energy
Dr. Qi Lin

E-Mail Website
Guest Editor
School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China
Interests: metamaterials; plasmonic absorber; optical force
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metamaterials, usually referred to as artificial composites, have attracted extensive interest due to their peculiar electromagnetic (EM) features that natural materials cannot directly obtain. In addition to the studies and search for novel and exotic physical properties, metamaterial-based resonance devices also attracted considerable attention due to the fact that they have the ability to manipulate and control incident EM waves at sub-wavelength dimensions, which show promising applications in the fields of optical imaging, medical detection, mechanical engineering, communication, etc.

The core feature that affects the EM properties, functional devices, and applications of metamaterials is the structural design of their unit cells, not the materials that make them. As a result, the structural engineering of metamaterials has become a key factor affecting the properties of metamaterials. In terms of their structural engineering, symmetry and asymmetry structure design strategies appear in all aspects of metamaterials. This journal Symmetry conforms to the design principle of metamaterials.

In this Special Issue, we invite you to submit reviews, mini review, perspectives, and original research on the topic of metamaterials, as well as their applications. Particular attention will be given to the latest physical phenomena, principles and technologies of metamaterials.

Dr. Ben-Xin Wang
Dr. Han Xiong
Dr. Qi Lin
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. Symmetry 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

  • metamaterials
  • metasurfaces
  • sub-wavelength nanostructures
  • surface plasmonics resonance
  • metamaterials-based functional devices
  • applications of metamaterials

Published Papers (4 papers)

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Research

11 pages, 2279 KiB  
Article
A Highly Efficient Infinity-Shaped Large Angular- and Polarization-Independent Metamaterial Absorber
by Meshari Alsharari, Bo Bo Han, Shobhit K. Patel, Jaymit Surve, Khaled Aliqab and Ammar Armghan
Symmetry 2023, 15(2), 352; https://doi.org/10.3390/sym15020352 - 28 Jan 2023
Cited by 5 | Viewed by 1403
Abstract
An efficient diagonally symmetric infinity-shaped broadband solar absorber has been demonstrated in this research paper. The structure was developed with an infinity-shaped resonator made of titanium (Ti) and gallium arsenide (GaAs) at the base substrate layer to achieve absorption in a wideband spectrum [...] Read more.
An efficient diagonally symmetric infinity-shaped broadband solar absorber has been demonstrated in this research paper. The structure was developed with an infinity-shaped resonator made of titanium (Ti) and gallium arsenide (GaAs) at the base substrate layer to achieve absorption in a wideband spectrum under solar energy radiation, and absorption efficiencies were calculated employing the finite element method. The average solar energy absorption spectrum ranges from the ultraviolet to the mid-infrared regions, and 93.93% average absorption in this band is achieved. Moreover, bandwidths of 2800 and 1110 nm were observed, and, in these bands, we attained continuous absorption above 90% and 95%, respectively, with average absorption rates of 93.93% and 96.25%, respectively. Furthermore, based on this solar energy absorber, which was optimized after varying many design parameters, it is also observed that the developed design is angle-insensitive from 0° to 50° and polarization-insensitive from the results of the transverse electric (TE) and transverse magnetic (TM) modes. The developed infinity-shaped broadband solar absorber design is highly efficient and provides broadband absorptance that can be used as an absorber layer in solar cells. Full article
(This article belongs to the Special Issue Advances in Metamaterial and Symmetry/Asymmetry)
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14 pages, 4589 KiB  
Article
A New Design of a Terahertz Metamaterial Absorber for Gas Sensing Applications
by Sagnik Banerjee, Purba Dutta, Snehashish Basu, Sunil Kumar Mishra, Bhargav Appasani, Sarita Nanda, Yadgar I. Abdulkarim, Fahmi F. Muhammadsharif, Jian Dong, Amitkumar V. Jha, Nicu Bizon and Phatiphat Thounthong
Symmetry 2023, 15(1), 24; https://doi.org/10.3390/sym15010024 - 22 Dec 2022
Cited by 10 | Viewed by 2794
Abstract
Metamaterial absorbers are used in the terahertz frequency regime as photo-detectors, as sensing elements, in imaging applications, etc. Narrowband absorbers, on account of their ultra-slender bandwidth within the terahertz frequency spectrum, show a significant shift in the absorption peak when an extrinsic entity [...] Read more.
Metamaterial absorbers are used in the terahertz frequency regime as photo-detectors, as sensing elements, in imaging applications, etc. Narrowband absorbers, on account of their ultra-slender bandwidth within the terahertz frequency spectrum, show a significant shift in the absorption peak when an extrinsic entity relative to the absorber, like refractive index or temperature of the encircling medium, is altered. This property paves the path for the narrowband absorbers to be used as potential sensors to detect any alterations in the encircling medium. In this paper, a novel design of a terahertz metamaterial (MTM) absorber is proposed, which can sense the variations in the refractive index (RI) of the surrounding medium. The effective permeability of the structure is negative, while its permittivity is positive; thus, it is a μ-negative metamaterial. The layout involves a swastika-shaped design made of gold on top of a dielectric gallium arsenide (GaAs) substrate. The proposed absorber achieved a nearly perfect absorption of 99.65% at 2.905 terahertz (THz), resulting in a quality factor (Q-factor) of 145.25. The proposed design has a sensitivity of 2.12 THz/RIU over a range of varied refractive index from n = 1.00 to n = 1.05 with a step size of 0.005, thereby achieving a Figure of Merit (FoM) of 106. Furthermore, the sensor was found to have a polarization-insensitive characteristic. Considering its high sensitivity (S), the proposed sensor was further tested for gas sensing applications of harmful gases. As a case study, the sensor was used to detect chloroform. The proposed work can be the foundation for developing highly sensitive gas sensors. Full article
(This article belongs to the Special Issue Advances in Metamaterial and Symmetry/Asymmetry)
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11 pages, 5700 KiB  
Article
Design of an Optically Transparent Microwave Absorber Based on Coding Metasurface
by Senfeng Lai, Guiyang Liu, Yanpei Guo and Yang Liu
Symmetry 2022, 14(10), 2217; https://doi.org/10.3390/sym14102217 - 21 Oct 2022
Cited by 6 | Viewed by 1493
Abstract
In this paper, a metamaterial absorber with a checkerboard patterned ITO (indium tin oxide) film as the surface is obtained by using flexible and optically transparent wave-absorbing material ITO–PET (polyethylene terephthalate), and a coding arrangement of two basic coding units based on the [...] Read more.
In this paper, a metamaterial absorber with a checkerboard patterned ITO (indium tin oxide) film as the surface is obtained by using flexible and optically transparent wave-absorbing material ITO–PET (polyethylene terephthalate), and a coding arrangement of two basic coding units based on the APS-PSO (Array Pattern Synthesis -Particle Swarm Optimization) algorithm. The surface structure of the absorber consists of ITO rectangular patch structures and ITO circular patch structures (110 Ω/sq). The ITO rectangular patch structures and ITO circular patch structures are symmetrical. The middle layer is made up of two layers of PET and one layer of PMMA, and the bottom surface is covered with a layer of low square resistance ITO film (8 Ω/sq). The experimental results, which are consistent with the simulation results, show that the absorber has superior performance: over 90% absorptance in the 5.06–9.01 GHz band, high transmittance, and a −10 dBsm RCS (radar cross-section) reduction in the 5.3–8.7 GHz band. This design also has polarization insensitivity and angular stability. Full article
(This article belongs to the Special Issue Advances in Metamaterial and Symmetry/Asymmetry)
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19 pages, 4893 KiB  
Article
A Symmetrical Terahertz Triple-Band Metamaterial Absorber Using a Four-Capacitance Loaded Complementary Circular Split Ring Resonator and an Ultra-Thin ZnSe Substrate
by Yadgar I. Abdulkarim, Fatih Özkan Alkurt, Halgurd N. Awl, Olcay Altıntaş, Fahmi F. Muhammadsharif, Bhargav Appasani, Mehmet Bakır, Muharrem Karaaslan, Mohamed Taouzari and Jian Dong
Symmetry 2022, 14(7), 1477; https://doi.org/10.3390/sym14071477 - 19 Jul 2022
Cited by 11 | Viewed by 2091
Abstract
In this research work, a symmetrical four-capacitance loaded complementary circular split ring resonator is proposed, which uses an ultra-thin Zinc Selenide (ZnSe) substrate to realize a low-profile triple-band metamaterial (MTM) perfect absorber for application in the terahertz (THz) frequency range. The electromagnetic properties [...] Read more.
In this research work, a symmetrical four-capacitance loaded complementary circular split ring resonator is proposed, which uses an ultra-thin Zinc Selenide (ZnSe) substrate to realize a low-profile triple-band metamaterial (MTM) perfect absorber for application in the terahertz (THz) frequency range. The electromagnetic properties of the proposed structure were calculated and investigated using the Finite Integration Technique (FIT). The proposed structure exhibited three highly absorptive (nearly perfect) peaks at the resonance frequencies of 15.68 THz, 37.48 THz, and 39.55 THz. Furthermore, the absorber was found to be insensitive to the polarization and incident wave angles, due to its symmetrical design. The effects of the conductor type, substrate thickness, unit cell dimension, resonator gap, and substrate type on the reflection and absorption spectra were investigated. To validate the numerical results, the proposed design was analyzed using High-Frequency Simulation Software (HFSS) and Advanced Design System (ADS). The surface current, electric field, and magnetic field distributions at the three-resonance frequency were analyzed. It was concluded that the overall performance of the proposed MTM structure was superior compared to those reported in the literature. The proposed design could be a good candidate for application in stealth technology, imaging, and thermal energy harvesting. Full article
(This article belongs to the Special Issue Advances in Metamaterial and Symmetry/Asymmetry)
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