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Crystals
Special Issues
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 "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (10 April 2022) | Viewed by 7811

Special Issue Editors

Dr. Han Meng

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Guest Editor
Department of Mechanical and Construction Engineering, Northumbria University, Nottingham, NE1 8ST, UK
Interests: metamaterials; sound absorption; vibration; lightweight structures; transmission; porous materials
Dr. Hamdi Torun

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Guest Editor
Affiliation: Smart Materials & Surfaces Laboratory, Faculty of Engineering & Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, U.K.
Interests: metamaterials; sensors; microengineering; acoustofluidics
Special Issues, Collections and Topics in MDPI journals
Dr. Yanyu Chen

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Guest Editor
Department of Mechanical Engineering, University of Louisville, Louisville, KY 40292, USA
Interests: phononic metamaterials; architected metamaterials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Dimitrios Chronopoulos

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Guest Editor
Department of Mechanical Engineering & Mecha(tro)nic System Dynamics (LMSD), KU Leuven, 9000 Leuven, Belgium
Interests: ultrasound metamaterials; metamaterials for structural health monitoring applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metamaterials are engineered materials/structures with novel characteristics that enable new material and device functionalities that cannot be achieved with conventional materials. Metamaterials are generally composed of periodic or quasiperiodic units made from assemblies of multiple elements. The properties of metamaterials are defined by their assembled structures instead of their constituent elements. We can control the behaviors of metamaterials by the precise manipulation of the shape, geometry, size, orientation, material composition and distribution of their constituent elements. The investigation of metamaterials has progressed phenomenally in a wide variety of scientific areas, and various types of metamaterials have been achieved (electromagnetic, optical, elastic, acoustic, mechanical, thermal, etc.). Metamaterials have demonstrated applications or potential applications in diverse engineering sectors, such as energy, aerospace, health care, vehicles, transducers/sensors, construction, manufacturing, and robotics. The output value of the metamaterial industry is predicted to reach a huge value in the coming decades according to recent market research studies.

For this Special Issue, we invite all contributions related to the challenges in metamaterial research. The topics of the Special Issue include but are not limited to the concept, characterization, theory, mechanism, simulation, structure design, fabrication, testing, optimization, application exploration and market analysis of metamaterials. Papers in the form of short communications, reviews and research articles are all welcomed for submission to this Special Issue.

Dr. Han Meng
Dr Hamdi Torun
Dr. Yanyu Chen
Prof. Dr. Dimitrios Chronopoulos
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. 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 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

  •  metamaterials
  •  electromagnetic metamaterials
  •  photonic metamaterials
  •  elastic metamaterials
  •  acoustic metamaterials
  •  mechanical metamaterials
  •  functional materials
  •  reconfigurable materials
  •  chirality

Published Papers (4 papers)

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Research

14 pages, 5115 KiB  
Article
Steer by Image Technology for Intelligent Reflecting Surface Based on Reconfigurable Metasurface with Photodiodes as Tunable Elements
by David Rotshild, Daniel Rozban, Efi Rahamim, Asaf Barom, Rotem Yosef, Liel Bhanam and Amir Abramovich
Crystals 2022, 12(7), 951; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12070951 - 07 Jul 2022
Cited by 1 | Viewed by 1944
Abstract
Lately, metasurface has become an essential and promising component in implementing Intelligent Reflecting Surface (IRS) for 5G and 6G. A novel method that simplifies the ability to reconfigure the metasurface is presented in this paper. The suggested technology uses a PIN photodiode as [...] Read more.
Lately, metasurface has become an essential and promising component in implementing Intelligent Reflecting Surface (IRS) for 5G and 6G. A novel method that simplifies the ability to reconfigure the metasurface is presented in this paper. The suggested technology uses a PIN photodiode as a tuning element. The desired image is projected on the metasurface’s backside, where the PIN photodiodes are placed and reconfigures the metasurface. The projected image’s color and intensity pattern influence the PIN photodiode’s junction capacitance, which leads to local reflection phase control. This enables the required pattern reflection phase distribution to manipulate the reflection beam, for example, 2D beam steering or focusing, and any other beam forming combination, instead of wiring many digital-to-analog converters (DACs) or FPGA outputs, which bias the standard tuning element such as PIN diode or varactor using a complex RF circuit. Using a PIN photodiode as a tunable element instead of a varactor diode, PIN diode, Liquid Crystal and MEMS allows the changing of the internal junction capacitance without direct contact and thus continuously controlling the reflection phase. In addition, an open circuit work mode with negligible energy consumption can be obtained. This technology can be used to implement metasurface based on discrete or continuous phases and is called Steer by Image (SBI). A full description of the SBI technology using PIN photodiode is presented in this paper. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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16 pages, 4722 KiB  
Article
Analytical and Numerical Analyses of Multilayer Photonic Metamaterial Slab Optical Waveguide Structures with Kerr-Type Nonlinear Cladding and Substrate
by Yaw-Dong Wu, Yi-Jun Xu, Tien-Tsorng Shih and Ming-Hsiung Cheng
Crystals 2022, 12(5), 628; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12050628 - 27 Apr 2022
Cited by 1 | Viewed by 1567
Abstract
In this paper, we propose the analytical and numerical analyses of multilayer photonic metamaterial slab optical waveguide structures with Kerr-type nonlinear cladding and substrate. The multiple-quantum-well (MQW) photonic metamaterial optical waveguide structure with Kerr-type nonlinear cladding and substrate was also analyzed. We can [...] Read more.
In this paper, we propose the analytical and numerical analyses of multilayer photonic metamaterial slab optical waveguide structures with Kerr-type nonlinear cladding and substrate. The multiple-quantum-well (MQW) photonic metamaterial optical waveguide structure with Kerr-type nonlinear cladding and substrate was also analyzed. We can use the proposed method to study the multilayer optical metamaterial slab optical waveguide structure with the linear cladding and substrate. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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13 pages, 433 KiB  
Article
Homogenization of Complex Lattices for Metamaterials: Open Problems and Conjectures
by Paolo Maria Mariano
Crystals 2022, 12(5), 612; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12050612 - 26 Apr 2022
Viewed by 1751
Abstract
Based on concrete examples dealing with one-level periodic and quasi-periodic, and two-level periodic lattices, we show that the homogenization of complex lattices generically requires a multi-field continuum approach. We do not present results for specific cases, rather we discuss some related open problems [...] Read more.
Based on concrete examples dealing with one-level periodic and quasi-periodic, and two-level periodic lattices, we show that the homogenization of complex lattices generically requires a multi-field continuum approach. We do not present results for specific cases, rather we discuss some related open problems and formulate pertinent conjectures. In this way, we suggest in essence a possible research program addressed towards the design of metamaterials. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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18 pages, 9772 KiB  
Article
A New Compact Split Ring Resonator Based Double Inverse Epsilon Shaped Metamaterial for Triple Band Satellite and Radar Communication
by Md Salah Uddin Afsar, Mohammad Rashed Iqbal Faruque, Mayeen Uddin Khandaker, Amal Alqahtani and David A. Bradley
Crystals 2022, 12(4), 520; https://0-doi-org.brum.beds.ac.uk/10.3390/cryst12040520 - 08 Apr 2022
Cited by 6 | Viewed by 1882
Abstract
This study presents a double-inverse-epsilon-shaped, triple-band epsilon-negative (ENG) metamaterial with two split ring resonators (SRRs). The proposed unit cell comprises a single slit two SRRs with two inverse-epsilon-shaped metal bits. Rogers RT6002, of dimension 10 × 10 × 1.524 mm3, is [...] Read more.
This study presents a double-inverse-epsilon-shaped, triple-band epsilon-negative (ENG) metamaterial with two split ring resonators (SRRs). The proposed unit cell comprises a single slit two SRRs with two inverse-epsilon-shaped metal bits. Rogers RT6002, of dimension 10 × 10 × 1.524 mm3, is used as a substrate. An electromagnetic simulator CST microwave studio is used to investigate the effective medium parameters of the material. The proposed metamaterial shows three resonance peaks that are demarcated at the frequencies 2.38 GHz, 4.55 GHz and 9.42 GHz consecutively. The negative permittivity of the metamaterial is observed at the frequency ranges of 2.39–2.62 GHz, 4.55–4.80 GHz and 9.42–10.25 GHz. The goodness of the material was presented by the effective medium ratio (EMR) of the unit cell at 12.61. In addition, the simulated results are authenticated by using different electromagnetic simulators such as HFSS and ADS for the equivalent circuit model, which exhibits insignificant disparity. The anticipated scheme was finalised through some parametric analyses, together with configuration optimisation, different unit cell dimensions, several substrate materials, and altered electromagnetic (EM) field transmissions. The proposed triple band (S-, C- and X-bands) with negative permittivity (ε) metamaterial is practically used for numerous wireless uses, for instance, far distance radar communication, satellite communication bands and microwave communication. Full article
(This article belongs to the Special Issue Advances in Metamaterials)
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