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Advances in Functional Metamaterials
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Advances in Functional Metamaterials

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

Deadline for manuscript submissions: closed (10 October 2023) | Viewed by 1433

Special Issue Editor

Prof. Dr. Tatjana Gric

E-Mail Website
Guest Editor
Department of Electronic Systems, Vilnius Gediminas Technical University, 10221 Vilnius, Lithuania
Interests: photonics; plasmonics; metamaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is devoted to recent developments in the field of artificial materials and their applications, ranging from compositions and structures, such as the orientation, arrangement, geometry, size, and shape, to smart properties, including the manipulation of electromagnetic waves by blocking, absorbing, enhancing, or bending waves. Over the past 20 years, techniques for producing nanostructures have matured, resulting in a wide range of ground-breaking solutions able to control light and heat on very small scales. Some areas of advancement that have contributed to these techniques are photonic crystals, nanolithography, plasmonic phenomena, and nanoparticle manipulation. From these advances, a new branch of novel material science has emerged—metamaterials. Metamaterials have recently been embedding novel quantum materials such as graphene, dielectric nanostructures, and, as metasurfaces, surface geometries and surface waves, while also embracing new functionalities such as nonlinearity, quantum gain, and strong light-matter coupling. The Special Issue hopes to provide a unique topical opportunity for engineers, students, researchers, and professionals from academia and industries alike to present their research results, breakthrough innovations, discoveries, path-breaking ideas, experiences, and products displayed at an international platform.

Prof. Dr. Tatjana Gric
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

  • metamaterial
  • photonic crystal
  • anisotropy
  • disorder
  • nanostructures
  • artificial material

Published Papers (1 paper)

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Research

18 pages, 6443 KiB  
Article
Structural, Optical, Charge-Transport, and Dielectric Properties of Double-Perovskite La2Co1−zFezMnO6 (z = 0, 0.2–1.0)
by Ghulam Hussain, Shanta Batool, Yuruo Zheng, Shuyi Li and Xiawa Wang
Materials 2022, 15(18), 6249; https://doi.org/10.3390/ma15186249 - 08 Sep 2022
Cited by 3 | Viewed by 1065
Abstract
A series of double-perovskite La2Co1−zFezMnO6 (z = 0, 0.2–1.0) ceramics were synthesized using a well-established sol–gel method. The series of samples with a monoclinic phase and a P21/n symmetry were characterized by XRD, FTIR, [...] Read more.
A series of double-perovskite La2Co1−zFezMnO6 (z = 0, 0.2–1.0) ceramics were synthesized using a well-established sol–gel method. The series of samples with a monoclinic phase and a P21/n symmetry were characterized by XRD, FTIR, conductivity, and capacitance measurement to extract charge-transport and dielectric characteristics at room temperature. The obtained IR spectra fitted well with the Lorentz oscillator model to calculate the damping factor, optical frequency, and oscillator strength and compared with the theory, which gave better agreement. The calculated activation energies from the Arrhenius plot supported the semiconducting nature of all samples. The temperature and frequency-dependent dielectric parameters, such as the real part (εr′), imaginary part (ε″) of the dielectric constant, dielectric loss (tanδ), and ac-conductivity (σac) were extracted. The dielectric constant (εr′,  ε″) and dielectric loss (tanδ) were enhanced at a low frequency, while the ac-conductivity (σac) displayed higher values at higher frequencies. The enhancement in the dielectric parameters with increasing iron concentrations arose due to the higher surface volume fraction of iron (Fe3+) ions than the cobalt (Co3+) ions. The radius of the Fe3+ (0.645 Å) was relatively higher than the Co3+ ions (0.61 Å), significantly influenced by the grains and grain boundaries, and enhanced the barrier for charge mobility at the grain boundaries that play a vital role in space charge polarization. Full article
(This article belongs to the Special Issue Advances in Functional Metamaterials)
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