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Theory and Applications of Metamaterials
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Theory and Applications of Metamaterials

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

Deadline for manuscript submissions: closed (10 November 2023) | Viewed by 3048

Special Issue Editor

Dr. Zacharias A. Viskadourakis

E-Mail Website
Guest Editor
Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure and Laser (IESL), N. Plastira 100, GR-70013 Heraklion, Greece
Interests: metamaterials; energy harvesting; magnetism; superconductivity; strongly correlated systems; 3D printing; thin films; ferroelectrics; multiferroics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metamaterials are human-made materials which exhibit specific electromagnetic properties and functions, which are not available in any known natural material. Such properties include a negative refractive index, large positive refractive index, magnetism at optical frequencies, perfect absorption, and enhanced nonlinear optical properties, to name a few. Such extraordinary properties provide people with powerful tools to manipulate electromagnetic waves in a wide range of frequencies, from acoustic waves up to the optical regime. Therefore, metamaterials have been realized for a great variety of applications, such as electromagnetic shields, polarizers, sensors, electromagnetic beam splitters, broadband pulse delay devices, energy harvesting, etc.

The main purpose of the proposed Special Issue is to explore aspects of metamaterials, both theoretically and experimentally, in order to understand in depth the origin of their fascinating properties. In addition, the present Special Issue aims to gather recent progress in possible and potential applications of metamaterials. Since both theoretical and experimental investigations are still being carried out in the area of metamaterials, this specified issue will contribute towards such a direction.

Potential topics include (but are not limited to):

  • New designs for metamaterials
  • Two-dimensional metamaterials (metasurfaces)
  • Additive manufactured (3D-printed) metamaterials
  • Metamaterials for energy harvesting
  • Metamaterials for sensing applications
  • Magnetic metamaterials

We look forward to submissions of great scientific impact, addressing and realizing the challenges of metamaterials.

Dr. Zacharias A. Viskadourakis
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

  • metamaterials
  • metasurfaces
  • magnetic metamaterials
  • additive manufactured (3D printed) metamaterials
  • energy harvesting
  • sensing applications

Published Papers (2 papers)

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16 pages, 5818 KiB  
Article
The Combined Spectral Response of a MEMS Metamaterial Absorber for the Mid-IR and Its Sub-Wavelength Fabrication Residual Array of Holes
by Reinoud F. Wolffenbuttel and M. Amir Ghaderi
Materials 2023, 16(12), 4278; https://0-doi-org.brum.beds.ac.uk/10.3390/ma16124278 - 9 Jun 2023
Viewed by 970
Abstract
Metasurface coatings on a free-standing SiN thin film membrane are fabricated on a Si substrate using masked lithography and CMOS-compatible surface micromachining. The result is a band-limited absorber for the mid-IR, which is part of a microstructure that is attached to the substrate [...] Read more.
Metasurface coatings on a free-standing SiN thin film membrane are fabricated on a Si substrate using masked lithography and CMOS-compatible surface micromachining. The result is a band-limited absorber for the mid-IR, which is part of a microstructure that is attached to the substrate by long and slender suspension beams to provide thermal isolation. As a residual of the fabrication, the regular pattern of sub-wavelength unit cells of 2.6 μm side length, which defines the metasurface, is interrupted by an equally regular array of sub-wavelength holes of 1–2 μm diameter and at 7.8–15.6 μm of pitch. This array of holes is essential for enabling access of the etchant and attack of the underlying layer during fabrication, which ultimately results in the sacrificial release of the membrane from the underlying substrate. As the plasmonic responses of the two patterns interfere, a maximum is imposed on the hole diameter and a minimum on the hole-to-hole pitch. However, the hole diameter should be sufficiently large to allow access of the etchant, while the maximum spacing between holes is set by the limited selectivity of the different materials to the etchant during sacrificial release. The effect of the parasitic hole pattern on the spectral absorption of a metasurface design is analyzed by simulations of the responses of combined holes–metasurface structures. Arrays of 300 × 180 μm2 Al-Al2O3-Al MIM structures are mask-fabricated on suspended SiN beams. The results show that the effect of the array of holes can be disregarded for a hole-to-hole pitch larger than 6 times the side length of the metamaterial until cell, while the diameter of the hole should remain smaller than about 1.5 μm, and their alignment is critical. Full article
(This article belongs to the Special Issue Theory and Applications of Metamaterials)
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14 pages, 4415 KiB  
Article
Fabrication of Metasurfaces on Building Construction Materials for Potential Electromagnetic Applications in the Microwave Band
by Zacharias Viskadourakis, Konstantinos Grammatikakis, Klytaimnistra Katsara, Argyri Drymiskianaki and George Kenanakis
Materials 2022, 15(20), 7315; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15207315 - 19 Oct 2022
Cited by 3 | Viewed by 1589
Abstract
Energy self-sufficiency, as well as optimal management of power in buildings is gaining importance, while obtaining power from traditional fossil energy sources is becoming more and more expensive. In this context, millimeter-scale metasurfaces can be employed to harvest energy from microwave sources. They [...] Read more.
Energy self-sufficiency, as well as optimal management of power in buildings is gaining importance, while obtaining power from traditional fossil energy sources is becoming more and more expensive. In this context, millimeter-scale metasurfaces can be employed to harvest energy from microwave sources. They can also be used as sensors in the microwave regime for efficient power management solutions. In the current study, a simple spray printing method is proposed to develop metasurfaces in construction materials, i.e., plasterboard and wood. Such materials are used in the interior design of buildings; therefore, the implementation of metasurfaces in large areas, such as walls, doors and floors, is realized. The fabricated metasurfaces were characterized regarding their electromagnetic performance. It is hereby shown that the investigated metasurfaces exhibit an efficient electromagnetic response in the frequency range (4–7 GHz), depending on the MS. Thus, spray-printed metasurfaces integrated on construction materials can potentially be used for electromagnetic applications, for buildings’ power self-efficiency and management. Full article
(This article belongs to the Special Issue Theory and Applications of Metamaterials)
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