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Ultra-Broadband Terahertz Absorbers Based on 4 × 4 Cascaded Metal-Dielectric Pairs

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Abstract

We present an ultra-broadband metamaterial absorber in the terahertz regime based on the proposed 4 × 4 cascaded metal-dielectric pairs, which would help to reduce the demand for fabrication precision. The generation mechanism of electromagnetic resonances and the formation process of the ultra-broadband absorption were investigated by finite-difference time-domain (FDTD) method. Numerical results showed that absorptivity of ∼92 % was obtained between 3.2 and 11.8 THz using the 4 × 4 structure. Such absorber was one of potential candidates for rough terahertz frequency estimator with an average detection resolution of 0.56 THz within a 9-THz range, which could be a supplement to the active terahertz spectrum analyzers with high resolution but limited measurement range (∼1 THz).

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Acknowledgments

The work was supported by the National Basic Research Program of China (2013CBA01700 and 2012CB315704), Natural Science Foundation of China (61325023), Research Fund for the Doctoral Program of Higher Education of China (20130184110015), and the Funds for the Excellent Ph.D. Dissertation of Southwest Jiaotong University in 2012.

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Authors and Affiliations

  1. Center for Information Photonics & Communications, School of Information Science & Technology, Southwest Jiaotong University, 610031, Chengdu, Sichuan, China

    Yinghui Guo, Lianshan Yan, Wei Pan & Bin Luo

  2. State Key Lab of Optical Technology for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Science, 610029, Chengdu, China

    Xiangang Luo

Authors
  1. Yinghui Guo
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  2. Lianshan Yan
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  3. Wei Pan
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  4. Bin Luo
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  5. Xiangang Luo
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Correspondence to Lianshan Yan.

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Guo, Y., Yan, L., Pan, W. et al. Ultra-Broadband Terahertz Absorbers Based on 4 × 4 Cascaded Metal-Dielectric Pairs. Plasmonics 9, 951–957 (2014). https://doi.org/10.1007/s11468-014-9701-8

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  • DOI: https://doi.org/10.1007/s11468-014-9701-8

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