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Crystals
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Advances in Metamaterials
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Advances in Metamaterials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 13170

Special Issue Editor

Prof. Dr. Youngpak Lee

E-Mail Website
Guest Editor
1. Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
2. Quantum Photonic Science Research Center and RINS, Department of Physics, Hanyang University, Seoul 04763, Republic of Korea
Interests: metamaterials; spin-photonic crystals; magneto-optical properties
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In the past two decades, metamaterials (MMs) have led a revolution in new material science through the artificial arrangement of electric- and magnetic-resonance structures (meta-atoms) at subwavelength scale. In particular, they have enriched the fundamental rules of matter–light interactions, such as slow light, super resolution, super-lensing, and electromagnetic (EM) cloaking. The main reason for the attention paid to MMs is that they are very close in appearance to real life, such as perfect absorbers. EM MMs reveal remarkable responses to the incident EM wave, such as negative-refraction index, extraordinary optical transmission, electromagnetically induced transparency-like effects, and ultra-thin and broadband absorbers. The designed structures, the structural parameters, and the properties of materials used yield the effective electric permittivity (εeff(ω)) and the effective magnetic permeability (μeff(ω)) of overall MMs, based on the effective-medium theory. Studies on the control of EM response and its spatial distribution and dispersion are ripe and lead to potential and almost-realized applications. There have been emerging fields in MM research, such as nonlinear, switchable, gain-assisted, sensor, quantum, and coding MMs, all representing a variety of MM applications.

Prof. YoungPak Lee
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. Crystals 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 2100 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
  • applications
  • fundamental issues
  • emerging fields for MMs
  • electromagnetic response
  • magnetic-resonance
  • electric-resonance

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Published Papers (5 papers)

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Research

11 pages, 5202 KiB  
Article
Flexible Metamaterial Absorber with Tailored Bandwidth and High Absorption Performance
by Haiyu Zheng, Liangyao Chen and Young-Pak Lee
Crystals 2022, 12(2), 182; https://doi.org/10.3390/cryst12020182 - 26 Jan 2022
Cited by 10 | Viewed by 2567
Abstract
Different from previous works which have focused on broadening the bandwidth, we propose an electromagnetic absorber with a medium and tailored bandwidth absorption, which avoids the unnecessary absorption caused by the too-wide bandwidth. Nevertheless, absorption is extremely high to be more than 99% [...] Read more.
Different from previous works which have focused on broadening the bandwidth, we propose an electromagnetic absorber with a medium and tailored bandwidth absorption, which avoids the unnecessary absorption caused by the too-wide bandwidth. Nevertheless, absorption is extremely high to be more than 99% and 97% for the normal and even oblique (45°) incidence, respectively, in a tailored frequency range of 5.8 ± 0.25 GHz even for both TE and TM polarization. This means the absorber is insensitive to the polarization of incident electromagnetic wave. Furthermore, it is flexible, since the main portion of sample is soft and flexible polyimide. The same properties are also realized in a range of 10 ± 0.5 GHz through adjusting the parameters of structure. The center frequencies of 5.8 and 10 GHz are very useful in our daily life, and the cost of absorber is relative low. Therefore, we believe the absorber can be used in many practical fields such as vehicle high-pass applications and radars. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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12 pages, 3164 KiB  
Article
Sensing Glucose Concentration Using Symmetric Metasurfaces under Oblique Incident Terahertz Waves
by Ibraheem Al-Naib
Crystals 2021, 11(12), 1578; https://doi.org/10.3390/cryst11121578 - 17 Dec 2021
Cited by 14 | Viewed by 2817
Abstract
In this article, a planar metamaterial sensor designed at terahertz (THz) frequencies is utilized to sense glucose concentration levels that cover hypoglycemia, normal, and hyperglycemia conditions that vary from 54 to 342 mg/dL. The sensor was developed using a symmetric complementary split rectangular [...] Read more.
In this article, a planar metamaterial sensor designed at terahertz (THz) frequencies is utilized to sense glucose concentration levels that cover hypoglycemia, normal, and hyperglycemia conditions that vary from 54 to 342 mg/dL. The sensor was developed using a symmetric complementary split rectangular resonator at an oblique incidence angle. The resonance frequency shift was used as a measure of the changes in the glucose level of the samples. The increase in the glucose concentration level exhibited clear and noticeable redshifts in the resonance frequency. For instance, a 67.5 GHz redshift has been observed for a concentration level of 54 mg/dL and increased up to 122 GHz for the 342 mg/dL concentration level. Moreover, a high sensitivity level of 75,700 nm/RIU was observed for this design. In the future, the proposed THz sensors may have potential applications in diagnosing hypocalcemia and hyperglycemia cases. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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12 pages, 4810 KiB  
Article
Effect of Slab Reheating Temperature on Cold Rolling Texture Evolution of Nb-Containing Grain-Oriented Silicon Steel
by Liguang Wang, Shuhuan Wang, Jie Li, Jinyu Liang and Yunli Feng
Crystals 2021, 11(12), 1478; https://doi.org/10.3390/cryst11121478 - 28 Nov 2021
Cited by 3 | Viewed by 1892
Abstract
Texture control of grain-oriented silicon steel is the key factor to ensure the magnetic properties of the finished product. Nb-containing grain-oriented silicon steel with different slab reheating temperatures was hot rolled followed by single-stage or two-stage cold rolling, and the textures were also [...] Read more.
Texture control of grain-oriented silicon steel is the key factor to ensure the magnetic properties of the finished product. Nb-containing grain-oriented silicon steel with different slab reheating temperatures was hot rolled followed by single-stage or two-stage cold rolling, and the textures were also analyzed. In the single-stage cold rolling process, as the slab reheating temperature is reduced, the intensity of the rotating cube texture {100}<011> and Goss texture {011}<100> drops, and that of the {111}<112> texture increases. In the two-stage cold rolling process, with the decrease in the slab reheating temperature, the intensity of the {111}<112> texture increases from 4.958 to 6.809. At the same slab reheating temperature, the intensity of the rotating cube texture declines more significantly in the two-stage cold rolling process. Finally, two-stage cold rolling with the slab reheating temperature of 1220 °C is found to be more beneficial for the formation of a sharp Goss texture during the second recrystallization. The magnetic induction intensity B800 of the final product is 1.87 T, and the iron loss P1.7/50 is 1.36 W/kg. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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13 pages, 22213 KiB  
Article
Wideband Reflector and Analogue Electromagnetically Induced Reflection in Metamaterials
by Wei Huang, Ningye He, Renxia Ning and Zhenhai Chen
Crystals 2021, 11(8), 985; https://doi.org/10.3390/cryst11080985 - 19 Aug 2021
Viewed by 2013
Abstract
Metamaterials are highly demanded for advanced applications in absorbers, sensors, and filters. However, metamaterial reflectors, especially broadband reflectors, remain challenging. In this paper, we theoretically investigate a wideband metamaterial reflector which consists of cross shaped graphene strips and a silica (SiO2) [...] Read more.
Metamaterials are highly demanded for advanced applications in absorbers, sensors, and filters. However, metamaterial reflectors, especially broadband reflectors, remain challenging. In this paper, we theoretically investigate a wideband metamaterial reflector which consists of cross shaped graphene strips and a silica (SiO2) substrate. The cross shaped graphene strips are coated on the top of the structure, and the cross shape rotated 45° graphene strips are spun on the bottom of it. The calculated reflection can be tuned through length and width of the graphene strips. By comparison, not only broadband reflection but also analogue electromagnetically induced reflection (EIR) can be realized. Moreover, the structure can generate a bi-directional broadband reflection of insensitive polarization. This kind of bi-directional reflector at microwave frequencies is obtained because the top and bottom graphene strip structures are similar. We employ the electric field distribution of the designed structure to elucidate the mechanism of the analogue EIR effect. We further discuss the influence of incident angle on the analogue EIR effect. Such a bi-directional reflector can be potentially applied to a wideband reflector, antenna, and sensor. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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9 pages, 3259 KiB  
Article
Multi-Band Electromagnetically-Induced-Transparency Metamaterial Based on the Near-Field Coupling of Asymmetric Split-Ring and Cut-Wire Resonators in the GHz Regime
by Man Hoai Nam, Vu Thi Hong Hanh, Nguyen Ba Tuong, Bui Son Tung, Bui Xuan Khuyen, Vu Dinh Lam, Liang Yao Chen and Young Pak Lee
Crystals 2021, 11(2), 164; https://doi.org/10.3390/cryst11020164 - 6 Feb 2021
Cited by 6 | Viewed by 2509
Abstract
A metamaterial (MM), mimicking electromagnetically-induced transparency (EIT) in the GHz regime, was demonstrated numerically and experimentally by exploiting the near-field coupling of asymmetric split-ring and cut-wire resonators. By moving the resonators towards each other, the original resonance dip was transformed to a multi-band [...] Read more.
A metamaterial (MM), mimicking electromagnetically-induced transparency (EIT) in the GHz regime, was demonstrated numerically and experimentally by exploiting the near-field coupling of asymmetric split-ring and cut-wire resonators. By moving the resonators towards each other, the original resonance dip was transformed to a multi-band EIT. The phenomenon was explained clearly through the excitation of bright and dark modes. The dispersion characteristic of the proposed MM was also investigated, which showed a strongly-dispersive behavior, leading to a high group index and a time delay of the MM. Our work is expected to contribute a simple way to develop the potential devices based on the multi-band EIT effect. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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