Special Issue "Metamaterials and Devices"

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

Deadline for manuscript submissions: 31 May 2020.

Special Issue Editor

Prof. Eduard Karpov
Website
Guest Editor
Department of Civil and Materials Engineering, School of Engineering, University of Illinois at Chicago, 842 West Taylor St, M/C 246, Chicago, IL 60607, USA
Interests: mechanical metamaterials; nanomaterials theory and computation; surface phenomena in materials systems
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Special Issue Information

Dear Colleagues,

The purpose of this Special Issue is to highlight recent advances in metamaterials and devices, engineered material systems with dramatically enhanced physical properties, or properties nonexistent in natural materials. Examples include negative elastic moduli, negative thermal expansion, multistability transitions and polymorphism, symmetry breaking, control and localization of vibration and deformation energy, and frequency dependent electromagnetic, acoustic and mechanical properties.

This Special Issue covers all aspects of metamaterials research with an emphasis on understanding the role of structural hierarchy and basic physical phenomena that determine metamaterials functionality; generic analysis approaches leading to phase and stability diagrams mapping, novel design tools and manufacturing methods, and numerical modelling methods.

Prof. Eduard Karpov
Guest Editor

Manuscript Submission Information

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Keywords

  • metamaterial
  • metasurface
  • reverse property
  • nonlinear system
  • smart structure
  • multistable structure

Published Papers (6 papers)

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Research

Open AccessArticle
A Low-Profile Wideband Linear-to-Circular Polarization Conversion Slot Antenna Using Metasurface
Materials 2020, 13(5), 1164; https://doi.org/10.3390/ma13051164 - 05 Mar 2020
Abstract
A new low-profile wideband linear-to-circular polarization conversion microstrip slot antenna based on a metasurface for C-band satellite communication applications is proposed in this paper. The metasurface basically consists of four unit cells with parasitic square cross gaps arranged in a 2 × 2 [...] Read more.
A new low-profile wideband linear-to-circular polarization conversion microstrip slot antenna based on a metasurface for C-band satellite communication applications is proposed in this paper. The metasurface basically consists of four unit cells with parasitic square cross gaps arranged in a 2 × 2 layout. By loading the metasurface on the microstrip slot antenna, linearly polarized (LP) waves from the source antenna are converted into circularly polarized (CP) waves. Then, by etching three more parasitic square cross gaps in the middle of the metasurface, enhanced impedance bandwidth and axial ratio bandwidth (ARBW) are achieved. Furthermore, an equivalent circuit and a phase analysis are presented to explain how a wide ARBW is realized by the metasurface. A final model with an overall size of 36 × 36 × 3.5 mm3 (approximately 0.65λ0 × 0.65λ0 × 0.06λ0 at 5.5 GHz) was designed and fabricated. The measured S11 bandwidth and 3 dB ARBW were 39.25% from 4.28 GHz to 6.37 GHz and 17.77% from 5.18 GHz to 6.19 GHz, respectively. As a result, the proposed antenna shows great potential for satellite communication applications due to its low profile and compact structure, wide impedance bandwidth, and wide axial ratio bandwidth. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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Open AccessArticle
Simulated and Experimental Research of Multi-Band Acoustic Metamaterial with a Single Resonant Structure
Materials 2019, 12(21), 3469; https://doi.org/10.3390/ma12213469 - 23 Oct 2019
Abstract
We present a multi-band acoustic metamaterial (AMM) with a single structural unit of a nested split hollow sphere (NSHS). The transmissions of the NSHS-AMM from the simulation and experiment revealed two dips which were attributed to local coupling resonance. Using the retrieval method [...] Read more.
We present a multi-band acoustic metamaterial (AMM) with a single structural unit of a nested split hollow sphere (NSHS). The transmissions of the NSHS-AMM from the simulation and experiment revealed two dips which were attributed to local coupling resonance. Using the retrieval method from the experimental data, we calculated the effective modulus of the NSHS-AMM and found it to be negative near the bands of the two dips. The AMM with a negative modulus can be easily tuned due to the coupling effect in the NSHS. The two dips can be simultaneously tuned by changing the diameter and the direction angle of the split holes of the interior and exterior split hollow sphere (SHS) in the NSHS. We designed a three-nested SHS-AMM with a negative modulus in three bands. Given the obvious local coupling resonance in the NSHS, such NSHS-AMMs may provide a viable path for the design of broadband AMMs or acoustic metasurfaces. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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Open AccessArticle
Optically Transparent Metamaterial Absorber Using Inkjet Printing Technology
Materials 2019, 12(20), 3406; https://doi.org/10.3390/ma12203406 - 17 Oct 2019
Abstract
An optically transparent metamaterial absorber that can be obtained using inkjet printing technology is proposed. In order to make the metamaterial absorber optically transparent, an inkjet printer was used to fabricate a thin conductive loop pattern. The loop pattern had a width of [...] Read more.
An optically transparent metamaterial absorber that can be obtained using inkjet printing technology is proposed. In order to make the metamaterial absorber optically transparent, an inkjet printer was used to fabricate a thin conductive loop pattern. The loop pattern had a width of 0.2 mm and was located on the top surface of the metamaterial absorber, and polyethylene terephthalate films were used for fabricating the substrate. An optically transparent conductive indium tin oxide film was introduced in the bottom ground plane. Therefore, the proposed metamaterial absorber was optically transparent. The metamaterial absorber was demonstrated by performing a full-wave electromagnetic simulation and measured in free space. In the simulation, the 90% absorption bandwidth ranged from 26.6 to 28.8 GHz, while the measured 90% absorption bandwidth was 26.8–28.2 GHz. Therefore, it is successfully demonstrated by electromagnetic simulation and measurement results. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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Open AccessArticle
Frequency-Diverse Bunching Metamaterial Antenna for Coincidence Imaging
Materials 2019, 12(11), 1817; https://doi.org/10.3390/ma12111817 - 04 Jun 2019
Cited by 1
Abstract
A frequency-diverse bunching metamaterial antenna for coincidence imaging in the Ka band is proposed in this paper. The bunching metamaterial antenna includes a broadband circular array and a frequency-diverse bunching metalens. Firstly, in order to enhance the bunching characteristic, the broadband circular array [...] Read more.
A frequency-diverse bunching metamaterial antenna for coincidence imaging in the Ka band is proposed in this paper. The bunching metamaterial antenna includes a broadband circular array and a frequency-diverse bunching metalens. Firstly, in order to enhance the bunching characteristic, the broadband circular array is designed based on the 60-degree beamwidth design to generate radiation patterns from 32 GHz to 36 GHz. Then, types of metamaterial elements with different transmission phases are selected to form the frequency-diverse bunching metalens based on a random distribution design and gradient zoom coefficient design. Moreover, the bunching metamaterial antenna is constituted by loading the frequency-diverse bunching metalens to the broadband circular array, which can generate frequency-diverse bunching random radiation patterns with beamwidth less than 100 degrees from 32 GHz to 36 GHz. Furthermore, the performances of the bunching metamaterial antenna, including the reflection coefficient, the radiation efficiency, and the correlation coefficients of radiation patterns at different frequencies are evaluated. Finally, the coincidence imaging experiment is implemented using the bunching metamaterial antenna and the image of the target is reconstructed successfully. The design is verified by simulations and measurements. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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Open AccessArticle
Reprogramming Static Deformation Patterns in Mechanical Metamaterials
Materials 2018, 11(10), 2050; https://doi.org/10.3390/ma11102050 - 20 Oct 2018
Cited by 2
Abstract
This paper discusses an x-braced metamaterial lattice with the unusual property of exhibiting bandgaps in their deformation decay spectrum, and, hence, the capacity for reprogramming deformation patterns. The design of polarizing non-local lattice arising from the scenario of repeated zero eigenvalues of a [...] Read more.
This paper discusses an x-braced metamaterial lattice with the unusual property of exhibiting bandgaps in their deformation decay spectrum, and, hence, the capacity for reprogramming deformation patterns. The design of polarizing non-local lattice arising from the scenario of repeated zero eigenvalues of a system transfer matrix is also introduced. We develop a single mode fundamental solution for lattices with multiple degrees of freedom per node in the form of static Raleigh waves. These waves can be blocked at the material boundary when the solution is constructed with the polarization vectors of the bandgap. This single mode solution is used as a basis to build analytical displacement solutions for any applied essential and natural boundary condition. Subsequently, we address the bandgap design, leading to a comprehensive approach for predicting deformation pattern behavior within the interior of an x-braced plane lattice. Overall, we show that the stiffness parameter and unit-cell aspect ratio of the x-braced lattice can be tuned to completely block or filter static boundary deformations, and to reverse the dependence of deformation or strain energy decay parameter on the Raleigh wavenumber, a behavior known as the reverse Saint Venant’s edge effect (RSV). These findings could guide future research in engineering smart materials and structures with interesting functionalities, such as load pattern recognition, strain energy redistribution, and stress alleviation. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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Open AccessArticle
Tunable Acoustic Metasurface with High-Q Spectrum Splitting
Materials 2018, 11(10), 1976; https://doi.org/10.3390/ma11101976 - 14 Oct 2018
Cited by 4
Abstract
We propose a tunable acoustic metasurface using a nested structure as the microunit, which is constituted by two distinct resonators. Thanks to the coupling resonance for the microunit and by simply adjusting the rotation angle of the inner split cavity, this nested structure [...] Read more.
We propose a tunable acoustic metasurface using a nested structure as the microunit, which is constituted by two distinct resonators. Thanks to the coupling resonance for the microunit and by simply adjusting the rotation angle of the inner split cavity, this nested structure provides nearly 2π phase shift. The full-wave simulations demonstrate that the constructed metasurface can be tuned to reflect incident sound waves to different directions in the operation frequency region with a very narrow bandwidth, which is a key functionality for many applications such as filtering and imaging. Meanwhile, the reflected sound waves out of the operation frequency region always remain unchanged. As a result, a high Q-factor spectrum splitting can be realised. The presented metasurface is of importance to develop many metamaterial-based devices, such as tunable acoustic cloaks and acoustic switching devices. Full article
(This article belongs to the Special Issue Metamaterials and Devices)
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