Artificial Electromagnetic Materials: Synthesis, Characterization, and Symmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (10 January 2023) | Viewed by 1236

Special Issue Editor


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Guest Editor
School of Physics and Electronics, Hunan University, Changsha 410082, China
Interests: photonic crystals; metamaterial

Special Issue Information

Dear Colleagues, 

Artificial electromagnetic materials, such as metamaterials and photonic crystals, have shown their unique abilities in controlling the propagations of electromagnetic waves at will. Symmetry of the unit cell of artificial material always plays an important role in determining its electromagnetic properties. A small unit cell with fourfold symmetry is good for achieving polarization-independent electromagnetic responses. Changing the symmetry of the unit cell at the interface of the photonic crystal is a feasible way for effectively coupling the electromagnetic wave into photonic crystals. In this sense, symmetry could be an effective way for further enriching the controllable propagation of electromagnetic waves in artificial materials.

Prof. Dr. Zhixiang Tang
Guest Editor

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Keywords

  • metamaterials
  • metasurfaces
  • photonic crystals
  • negative refraction
  • parity-time symmetry

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Published Papers (1 paper)

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Research

11 pages, 4940 KiB  
Article
A Simple Metamaterial for High-Performance Spectrum-Selective Absorption in the Visible Region
by Xiubo Jia, Shenwei Yin and Zhixiang Tang
Symmetry 2022, 14(11), 2402; https://doi.org/10.3390/sym14112402 - 14 Nov 2022
Cited by 2 | Viewed by 2023
Abstract
In this paper, we numerically demonstrated a simple metamaterial for wide-angle and polarization-insensitive absorption in the visible region, which simultaneously showed a strongly suppressed absorption in the near-infrared region. Numerical simulations demonstrated that under normal incidence the proposed absorber had a high absorptivity [...] Read more.
In this paper, we numerically demonstrated a simple metamaterial for wide-angle and polarization-insensitive absorption in the visible region, which simultaneously showed a strongly suppressed absorption in the near-infrared region. Numerical simulations demonstrated that under normal incidence the proposed absorber had a high absorptivity almost over 90% in the wavelength range from 340 nm to 770 nm, while a low absorptivity less than 10% from 1 μm to 2 μm. Because a small unit cell with four-fold symmetry was utilized, the selective absorption of this nanostructure was almost independent of the incident angle and polarization of the incident light. To understand the underlying physical mechanisms, the impedance and the electromagnetic field distributions in a unit cell were analyzed. Moreover, the influence of the structural geometry parameters on the absorption spectrum was systematically studied. Our results may provide a method for using a simple nanostructure to reduce the radiative heat loss for the visible light thermal conversion, or to depress the temperature rise induced by the absorption of below-bandgap photons for photovoltaic solar cells working in the visible region. Full article
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