Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
7.4
5.3
Journals
Nanomaterials
Special Issues
Metamaterials, Nanocomposites and Applications
share announcement

Metamaterials, Nanocomposites and Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 12976

Special Issue Editor

Dr. Olga Caballero-Calero

E-Mail Website
Guest Editor
IMN-Instituto de Micro y Nanotecnología (CNM-CSIC), Madrid, Spain
Interests: metasurface; nanotechnology; nanoscience; smart metamaterials; energy harvesting; thermoelectricity

Special Issue Information

Dear Colleagues,

The different properties that matter exhibits at the nanoscale, combined with the increasing possibilities that the developments in nanotechnology bring for fabricating exotic nanostructured materials, are the core of the recent rise of a wide variety of metamaterials. These metamaterials are nanostructures that present behaviors that depend on their architecture and differ from the properties of the bulk. In most cases, through understanding their nature, interesting applications for these metamaterials can be found in a wide variety of areas, given that the tailoring of their properties can lead to optimized efficiencies that cannot be found otherwise. In fact, their possibilities are so vast, and the fabrication and characterization techniques have been evolving so fast in recent years, that their potential is not yet fully understood.

This Special Issue of Nanomaterials will focus on the most advanced fabrication techniques aiming at the nanoscale and how to control and tailor these nanostructures and the new fundamental properties that these artificially created metamaterials exhibit. The state of the art in this field covers the techniques that are used to create metamaterials, numerical modeling methods, and the different devices that are being fabricated out of these nano-engineered materials. Properties such as negative thermal expansion, symmetry breaking, and exotic electromagnetic, mechanical and acoustic properties can be found and tailored in different metamaterials.

Therefore, you are invited to submit your works related to metamaterials in any of its different versions to provide a complete vision on the latest developments on metamaterials and also have a glimpse of the not yet exploited possibilities that nanostructuration has.

Dr. Olga Caballero-Calero
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. Nanomaterials 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 2900 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
  • metasurface
  • nanotechnology
  • nanoscience
  • nonlinear effects
  • reverse properties
  • smart metamaterials
  • energy harvesting
  • terahertz metamaterials
  • acoustic metamaterials
  • piezoelectric metamaterials
  • chiral metamaterials

Published Papers (8 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

Jump to: Review

16 pages, 43017 KiB  
Article
Design and Optimization of an Ultrathin and Broadband Polarization-Insensitive Fractal FSS Using the Improved Bacteria Foraging Optimization Algorithm and Curve Fitting
by Yaxi Pan and Jian Dong
Nanomaterials 2023, 13(1), 191; https://doi.org/10.3390/nano13010191 - 01 Jan 2023
Cited by 16 | Viewed by 1732
Abstract
A frequency-selective surface (FSS) optimization method combining a curve-fitting technique and an improved bacterial foraging optimization (IBFO) algorithm is proposed. In the method, novel Koch curve-like FSS and Minkowski fractal islands FSS were designed with a desired resonance center frequency and bandwidth. The [...] Read more.
A frequency-selective surface (FSS) optimization method combining a curve-fitting technique and an improved bacterial foraging optimization (IBFO) algorithm is proposed. In the method, novel Koch curve-like FSS and Minkowski fractal islands FSS were designed with a desired resonance center frequency and bandwidth. The bacteria foraging optimization (BFO) algorithm is improved to enhance the performance of the FSS. A curve-fitting technique is provided to allow an intuitive and numerical analysis of the correspondence between the FSS structural parameters and the frequency response. The curve-fitting results are used to evaluate the fitness function of the IBFO algorithm, replacing multiple repeated calls to the electromagnetic simulation software with the curve-fitting equation and thus speeding up the design process. IBFO is compared with the classical BFO algorithm, the hybrid BFO-particle swarm optimization algorithm (BSO), and the artificial bee colony algorithm (ABC) to demonstrate its superior performance. The designed fractal FSS is fabricated and tested to verify the experimental results. The simulation and measurement results show that the proposed FSS has a fractional bandwidth of 91.7% in the frequency range of 3.41–9.19 GHz (S, C, and X-bands). In addition, the structure is very thin, with only 0.025λ and 0.067λ at the lowest and highest frequencies, respectively. The proposed fractal FSS has shown stable performance for both TE and TM polarizations at oblique incidence angles up to 45°. according to simulations and measurements. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

12 pages, 2686 KiB  
Article
Plasmon Resonances in 1D Nanowire Arrays and 3D Nanowire Networks of Topological Insulators and Metals
by Olga Caballero-Calero, Alejandra Ruiz-Clavijo, Cristina V. Manzano, Marisol Martín-González and Gaspar Armelles
Nanomaterials 2023, 13(1), 154; https://doi.org/10.3390/nano13010154 - 29 Dec 2022
Cited by 2 | Viewed by 1267
Abstract
The 1D nanowire arrays and 3D nanowire networks of topological insulators and metals have been fabricated by template-assisted deposition of Bi2Te3 and Ni inside anodic aluminum oxide (AAO) templates, respectively. Despite the different origins of the plasmon capabilities of the [...] Read more.
The 1D nanowire arrays and 3D nanowire networks of topological insulators and metals have been fabricated by template-assisted deposition of Bi2Te3 and Ni inside anodic aluminum oxide (AAO) templates, respectively. Despite the different origins of the plasmon capabilities of the two materials, the results indicate that the optical response is determined by plasmon resonances, whose position depends on the nanowire interactions and material properties. Due to the thermoelectric properties of Bi2Te3 nanowires, these plasmon resonances could be used to develop new ways of enhancing thermal gradients and their associated thermoelectric power. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Graphical abstract

11 pages, 13149 KiB  
Article
Broadband Bi-Directional All-Dielectric Transparent Metamaterial Absorber
by Miao Cao, Xiaojun Huang, Lina Gao, Xiaoyan Li, Linyan Guo and Helin Yang
Nanomaterials 2022, 12(23), 4124; https://doi.org/10.3390/nano12234124 - 22 Nov 2022
Cited by 2 | Viewed by 1132
Abstract
Water-based absorbers have shown great development potential in the past few years. In this paper, an all-dielectric transparent bi-directional water-based broadband metamaterial absorber is designed. The simulation results indicate that absorptance of the absorber is over 90% in 5.7–41.6 GHz, and its fraction [...] Read more.
Water-based absorbers have shown great development potential in the past few years. In this paper, an all-dielectric transparent bi-directional water-based broadband metamaterial absorber is designed. The simulation results indicate that absorptance of the absorber is over 90% in 5.7–41.6 GHz, and its fraction bandwidth is 151.8%. The experimental results are greatly consistent with the simulations. The designed absorber has excellent performances of polarization insensitivity, oblique incidence stability and thermal stability. When the absorptance is more than 0.8, the maximum incident angle reaches 40° in TE mode and is over 60° in TM mode. In 0–80 °C, absorptance of the absorber is hardly changed. Because of the optical transparency of the designed absorber, it can be extensively used in stealth window weapons and electromagnetic compatibility equipment. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

11 pages, 1022 KiB  
Article
Geometrical Parameter Effect on Plasmonic Scattering of Bimetallic Three-Layered Nanoshells
by Ji-Bao Hu, Yu-Lin Chen, Juan Li, Ye-Wan Ma and Chuan-Cun Shu
Nanomaterials 2022, 12(21), 3816; https://doi.org/10.3390/nano12213816 - 28 Oct 2022
Cited by 3 | Viewed by 1168
Abstract
Enhanced scattering from local surface plasmon resonance by light has attracted much attention due to its special applications in sensor, cell, and biological imaging . Here, we investigate the ratio of scattering to absorption in bimetallic three-layered nanoshells with different geometrical parameters using [...] Read more.
Enhanced scattering from local surface plasmon resonance by light has attracted much attention due to its special applications in sensor, cell, and biological imaging . Here, we investigate the ratio of scattering to absorption in bimetallic three-layered nanoshells with different geometrical parameters using quasi-static theory. We show that the ratio of scattering to absorption strongly depends on the inner radius, shell thickness, middle dielectric function, and surrounding medium function. To gain insight into the effect of such geometrical parameters on the plasmonic scattering, we also provide a comparison between silver–dielectric–gold nanoshells and gold–dielectric–silver nanoshells. This work provides an alternative approach to analyze the optical properties of bimetallic three-layered nanoshells with potential applications in sensors and photo-detectors. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

9 pages, 4606 KiB  
Article
Switchable Terahertz Absorber from Single Broadband to Dual Broadband Based on Graphene and Vanadium Dioxide
by Guan Wang, Tong Wu, Yang Jia, Yang Gao and Yachen Gao
Nanomaterials 2022, 12(13), 2172; https://doi.org/10.3390/nano12132172 - 24 Jun 2022
Cited by 14 | Viewed by 1732
Abstract
A multifunctional switchable terahertz (THz) absorber based on graphene and vanadium dioxide (VO2) is presented. The properties of the absorber are studied theoretically by the finite-difference time-domain (FDTD) method. The results illustrate that the structure switches between the single-broadband or double-broadband [...] Read more.
A multifunctional switchable terahertz (THz) absorber based on graphene and vanadium dioxide (VO2) is presented. The properties of the absorber are studied theoretically by the finite-difference time-domain (FDTD) method. The results illustrate that the structure switches between the single-broadband or double-broadband absorption depending on the temperature of VO2. Moreover, the amplitude of the absorptivity can be adjusted by changing the Fermi energy level (EF) of graphene or the conductivity of VO2 separately. Via impedance matching theory, the physical mechanism of the absorber is researched. Furthermore, the effects of incidence angle on absorption have also been studied. It is found that the absorber is insensitive to the polarization of electromagnetic waves. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

9 pages, 3706 KiB  
Article
Tunable Dual-Broadband Terahertz Absorber with Vanadium Dioxide Metamaterial
by Hengli Feng, Zuoxin Zhang, Jingyu Zhang, Dongchao Fang, Jincheng Wang, Chang Liu, Tong Wu, Guan Wang, Lehui Wang, Lingling Ran and Yang Gao
Nanomaterials 2022, 12(10), 1731; https://doi.org/10.3390/nano12101731 - 18 May 2022
Cited by 9 | Viewed by 1784
Abstract
A dual broadband terahertz bifunction absorber that can be actively tuned is proposed. The optical properties of the absorber were simulated and numerically calculated using the finite-difference time-domain (FDTD) method. The results show that when the conductivity of vanadium dioxide is less than [...] Read more.
A dual broadband terahertz bifunction absorber that can be actively tuned is proposed. The optical properties of the absorber were simulated and numerically calculated using the finite-difference time-domain (FDTD) method. The results show that when the conductivity of vanadium dioxide is less than σ0=8.5×103 S/m, the absorptance can be continuously adjusted between 2% and 100%. At vanadium dioxide conductivity greater than σ0=8.5×103 S/m, the absorption bandwidth of the absorber can be switched from 3.4 THz and 3.06 THz to 2.83 THz and none, respectively, and the absorptance remains above 90%. This achieves perfect modulation of the absorptance and absorption bandwidth. The physical mechanism of dual-broadband absorptions and perfect absorption is elucidated by impedance matching theory and electric field distribution. In addition, it also has the advantage of being polarization insensitive and maintaining stable absorption at wide angles of oblique incidence. The absorber may have applications in emerging fields such as modulators, stealth and light-guided optical switches. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

12 pages, 3844 KiB  
Article
Dynamic Modulation of THz Absorption Frequency, Bandwidth, and Amplitude via Strontium Titanate and Graphene
by Tong Wu, Guan Wang, Yang Jia, Yabin Shao, Yang Gao and Yachen Gao
Nanomaterials 2022, 12(8), 1353; https://doi.org/10.3390/nano12081353 - 14 Apr 2022
Cited by 11 | Viewed by 1602
Abstract
A multi-functional broadband absorber based on graphene and strontium titanate (STO) film was designed. Additionally, the frequency, bandwidth, and amplitude of the absorber could be tuned by adjusting temperature and Fermi level of the graphene. By using the finite-difference time-domain (FDTD) method, the [...] Read more.
A multi-functional broadband absorber based on graphene and strontium titanate (STO) film was designed. Additionally, the frequency, bandwidth, and amplitude of the absorber could be tuned by adjusting temperature and Fermi level of the graphene. By using the finite-difference time-domain (FDTD) method, the numerical calculation result shows that, when keeping the device temperature at 230 K and setting graphene Fermi level to be 1 eV, three absorption peaks at 1.72 THz, 2.08 THz, and 2.59 THz were realized and combined into a broadband absorption from 1.68 to 2.74 THz. As the STO temperature was increased from 230 K to 310 K, the center frequency moved from 2.2 THz to 2.45 THz; correspondingly, the broadband absorption range was widened from 1.06 THz to 1.24 THz. When the temperature was fixed at 230 K and the graphene Fermi level was tuned from 1 eV to 0.7 eV, the absorption bandwidth decreased from 1.06 THz to 0.64 THz. While the Fermi level was tuned continually to be 0.01 eV, only a single absorption peak with an absorption rate of 0.29 existed. The broadband absorption and tuning mechanism of the absorber were analyzed using impedance matching theory. Furthermore, we also studied the effect of incident angle and polarization direction on the properties of the absorber. The multi-functional tunable absorber provides potential applications for the design of more efficient terahertz functional devices in the future. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Figure 1

Review

Jump to: Research

23 pages, 4955 KiB  
Review
Progress in the Study of Vortex Pinning Centers in High-Temperature Superconducting Films
by Jian Zhang, Haiyan Wu, Guangzhen Zhao, Lu Han and Jun Zhang
Nanomaterials 2022, 12(22), 4000; https://doi.org/10.3390/nano12224000 - 13 Nov 2022
Cited by 3 | Viewed by 1645
Abstract
Since the discovery of high-temperature superconductors (HTSs), significant progress in the fabrication of HTS films has been achieved. In this review, we intend to provide an overview of recent progress in how and why superconductivity can be enhanced by introducing nanoscale vortex pinning [...] Read more.
Since the discovery of high-temperature superconductors (HTSs), significant progress in the fabrication of HTS films has been achieved. In this review, we intend to provide an overview of recent progress in how and why superconductivity can be enhanced by introducing nanoscale vortex pinning centers. The comprehensive control of morphology, dimension, orientation and concentration of artificial pinning centers (APCs) and the principle of vortex pinning are the focus of this review. According to the existing literature, HTSs with the best superconductivity can be obtained when one-dimensional (1D) and three-dimensional (3D) nanoscale APCs are combined for vortex pinning. Full article
(This article belongs to the Special Issue Metamaterials, Nanocomposites and Applications)
►▼ Show Figures

Graphical abstract

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-8
Back to TopTop