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Quad-Spectral Perfect Metamaterial Absorber at Terahertz Frequency Based on a Double-Layer Stacked Resonance Structure

Authors
  • Wang, Ben-Xin1
  • Xie, Qin1
  • Dong, Guangxi1
  • Huang, Wei-Qing2
  • 1 Jiangnan University, School of Science, Wuxi, 214122, China , Wuxi (China)
  • 2 Hunan University, School of Physics and Electronics, Changsha, 410082, China , Changsha (China)
Type
Published Article
Journal
Journal of Electronic Materials
Publisher
Springer US
Publication Date
Jan 28, 2019
Volume
48
Issue
4
Pages
2209–2214
Identifiers
DOI: 10.1007/s11664-019-06968-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

Development of multispectral perfect light absorbers for applications in biological sensing, spectroscopic imaging, and selective thermal emitters is urgently required. Unfortunately, current multispectral absorbers are typically only based on a combination of fundamental resonances of multiple resonators using the design concepts of a coplanar superunit structure or multiple vertically stacked layers, which does not introduce new resonances while such structures are difficult to fabricate. In this work, a type of quad-spectral absorber formed by a double-layer stacked resonant structure is presented and demonstrated. Numerical simulations show that the suggested structure can achieve near 100% absorption at four frequency bands. The quad-spectral absorption results from excitation of two sets consisting of the fundamental mode and third-order resonance of the designed structure. The suggested device is insensitive to the polarization of the incident light due to the high degree of symmetry of the resonance structure. Device parameters are investigated to further explore the physical origin of the quad-spectral absorption. Moreover, it is revealed that the number of resonance peaks can be further increased by employing one more layer.

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