Properties and Applications of Metamaterials

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 13971

Special Issue Editors

College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang, China
Interests: deformable electromagnetic material electromagnetic wave theory and application; chiral light field control; artificial electromagnetic medium; microwave/millimeter wave devices
Department of Mechanical and Industrial Engineering, Department of Electrical and Computer Engineering, Northeastern University, Boston, MA, USA
Interests: nano optics; plasmonics; metamaterials; biophotonics; nano optomechanics; machine learning for photonics
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, China
Interests: metamaterials; electromagnetism; transformation optics; plasmonics; graphene; 2D materials; topological photonics

Special Issue Information

Dear Colleagues,

In the last two decades, we have witnessed the rapid development of physics and applications in metamaterials. Metamaterials have received increasing attentions because of their multidiscipline properties, ranging from electromagnetics, photonics, mechanics, acoustics and thermodynamics. Enhanced wave–matter interactions in metamaterials enable outstanding applications, such as polarizers, absorbers, flat lenses, smart antennas, integrated lasers, topological devices and intelligent reflecting surfaces for communications.

This Special Issue of Nanomaterials, “Properties and Applications of Metamaterials”, aims to collect a compilation of articles that address both the theoretical challenges and latest applications in the development of metamaterials. Investigations cover all stages of the development process, ranging from a fundamental understanding of microscopic interactions and macroscopic effects to the devices’ fabrication techniques and industrial applications. We look forward to receiving your valuable contribution in the form of a review, communication or academic article!

Prof. Dr. Zuojia Wang
Prof. Dr. Yongmin Liu
Prof. Dr. Hongsheng Chen
Guest Editors

Manuscript Submission Information

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Keywords

  • electromagnetic metamaterials
  • photonic metamaterials
  • quantum metamaterials
  • mechanical and acoustic metamaterials
  • thermal metamaterials
  • topological metamaterials
  • metamaterial devices

Published Papers (5 papers)

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Research

13 pages, 6174 KiB  
Article
Double-Focusing Gradient-Index Lens with Elastic Bragg Mirror for Highly Efficient Energy Harvesting
Nanomaterials 2022, 12(6), 1019; https://doi.org/10.3390/nano12061019 - 21 Mar 2022
Cited by 7 | Viewed by 2244
Abstract
The applicability of piezoelectric energy harvesting is increasingly investigated in the field of renewable energy. In improving harvester efficiency, manipulating elastic waves through a geometric configuration as well as upgrading harvester elements is important. Periodic structures, such as phononic crystals and metamaterials, are [...] Read more.
The applicability of piezoelectric energy harvesting is increasingly investigated in the field of renewable energy. In improving harvester efficiency, manipulating elastic waves through a geometric configuration as well as upgrading harvester elements is important. Periodic structures, such as phononic crystals and metamaterials, are extensively employed to control elastic waves and enhance harvesting performance, particularly in terms of wave localization and focusing. In this study, we propose a double-focusing flexural energy harvesting platform consisting of a gradient-index lens and elastic Bragg mirror. Based on the design process, the frequency and time response of the harvesting platform are analyzed. The results indicate that the output voltage and power calculated at 1800 Ω are 7.9 and 62 times higher than those observed in the bare plate, respectively. Even when compared to the existing gradient-index system, they are 1.5 and 2.3 times higher, respectively. These findings can facilitate the usage of periodic structures as geometric stimuli to significantly enhance harvesting performance. Full article
(This article belongs to the Special Issue Properties and Applications of Metamaterials)
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12 pages, 3403 KiB  
Article
Reconfigurable Light Imaging in Photonic Higher-Order Topological Insulators
Nanomaterials 2022, 12(5), 819; https://doi.org/10.3390/nano12050819 - 28 Feb 2022
Cited by 4 | Viewed by 2085
Abstract
Topological phases of matter with robust edge states have revolutionized the fundamental intuitions for wave control. The recent development of higher-order topological insulators (HOTIs) realizes even lower dimensional topological states that enable versatile wave manipulations (e.g., light imaging). However, in conventional HOTIs, the [...] Read more.
Topological phases of matter with robust edge states have revolutionized the fundamental intuitions for wave control. The recent development of higher-order topological insulators (HOTIs) realizes even lower dimensional topological states that enable versatile wave manipulations (e.g., light imaging). However, in conventional HOTIs, the topological states are usually protected by certain crystalline symmetries and therefore bounded at specific locations, hindering their applications in modern digital ears, which often prefer tunability and reconfigurability. Here, we report the reconfigurable light imaging based on topological corner states and anti-chiral edge states in a two-dimensional (2D) photonic HOTI with a honeycomb lattice of yttrium iron garnet (YIG, a ferrite material) rods. Sublattices A and B are applied with magnetic fields in opposite directions, which realize the so-called modified Haldane model that hosts anti-chiral edge modes. By further breaking the lattice’s inversion symmetry via adjusting the radii of A and B rods, topological edge states with valley degrees of freedom emerge, which not only exhibit valley-dependence but also surprisingly show anti-chiral behaviors. In the valley edge gap, which is of nontrivial higher-order topology, corner states appear. With different combinations of corner states and anti-chiral edge states, versatile reconfigurable light imaging can be realized. As examples, a multiplexing waveguide-resonator device, a pine tree imaging that can be lit up or put out at will and selective imaging for partial objects in a two-heart pattern are demonstrated. The proposed HOTI shows high potential in future intelligent devices with exciting tunable and reconfigurable functions, which may inspire a wide range of applications such as topological switching, imaging processing, and nonreciprocal integrated photonics. Full article
(This article belongs to the Special Issue Properties and Applications of Metamaterials)
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14 pages, 6682 KiB  
Article
Manipulating Optical Scattering of Quasi-BIC in Dielectric Metasurface with Off-Center Hole
Nanomaterials 2022, 12(1), 54; https://doi.org/10.3390/nano12010054 - 25 Dec 2021
Cited by 13 | Viewed by 3617
Abstract
Bound states in the continuum (BICs) correspond to a particular leaky mode with an infinitely large quality-factor (Q-factor) located within the continuum spectrum. To date, most of the research work reported focuses on the BIC-enhanced light matter interaction due to its extreme near-field [...] Read more.
Bound states in the continuum (BICs) correspond to a particular leaky mode with an infinitely large quality-factor (Q-factor) located within the continuum spectrum. To date, most of the research work reported focuses on the BIC-enhanced light matter interaction due to its extreme near-field confinement. Little attention has been paid to the scattering properties of the BIC mode. In this work, we numerically study the far-field radiation manipulation of BICs by exploring multipole interference. By simply breaking the symmetry of the silicon metasurface, an ideal BIC is converted to a quasi-BIC with a finite Q-factor, which is manifested by the Fano resonance in the transmission spectrum. We found that both the intensity and directionality of the far-field radiation pattern can not only be tuned by the asymmetric parameters but can also experience huge changes around the resonance. Even for the same structure, two quasi-BICs show a different radiation pattern evolution when the asymmetric structure parameter d increases. It can be found that far-field radiation from one BIC evolves from electric-quadrupole-dominant radiation to toroidal-dipole-dominant radiation, whereas the other one shows electric-dipole-like radiation due to the interference of the magnetic dipole and electric quadrupole with the increasing asymmetric parameters. The result may find applications in high-directionality nonlinear optical devices and semiconductor lasers by using a quasi-BIC-based metasurface. Full article
(This article belongs to the Special Issue Properties and Applications of Metamaterials)
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12 pages, 6171 KiB  
Article
Spherical Aberration-Corrected Metalens for Polarization Multiplexed Imaging
Nanomaterials 2021, 11(11), 2774; https://doi.org/10.3390/nano11112774 - 20 Oct 2021
Cited by 6 | Viewed by 2634
Abstract
We present a terahertz spherical aberration-corrected metalens that uses the dynamic phase to achieve polarization multiplexed imaging. The designed metalens has polarization–dependent imaging efficiencies and polarization extinction ratios that exceed 50% and 10:1, respectively. Furthermore, opposite gradient phases can be applied to orthogonal [...] Read more.
We present a terahertz spherical aberration-corrected metalens that uses the dynamic phase to achieve polarization multiplexed imaging. The designed metalens has polarization–dependent imaging efficiencies and polarization extinction ratios that exceed 50% and 10:1, respectively. Furthermore, opposite gradient phases can be applied to orthogonal polarizations to shift the imaging of the two polarized sources in the longitudinal and transverse directions. Indeed, we find that the metalens has a smaller depth-of-focus than a traditional metalens when imaging point sources with limited objective lengths. These results provide a new approach for achieving multifunctional beam steering, tomographic imaging and chiroptical detection. Full article
(This article belongs to the Special Issue Properties and Applications of Metamaterials)
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13 pages, 3841 KiB  
Article
High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface
Nanomaterials 2021, 11(9), 2410; https://doi.org/10.3390/nano11092410 - 16 Sep 2021
Cited by 5 | Viewed by 2214
Abstract
Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance [...] Read more.
Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices. Full article
(This article belongs to the Special Issue Properties and Applications of Metamaterials)
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