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A dual-band terahertz metamaterial sensor with high Q-factor and sensitivity

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Abstract

A terahertz metamaterial absorption sensor with polarization insensitivity and dual-band characteristics is designed and analyzed in this paper. The proposed sensor produces two absorption peaks at 0.73 and 2.2 THz, with absorptivity up to 99.8%, and their Q-factor is 22.8 and 40.7, respectively. In addition, when the refractive index is 1.4, and the THz wave is vertically incident, by varying the thickness of the analyte layer in the range of 1–8 \(\upmu\)m, we get the average thickness sensitivity of the two absorption peaks is 4.1 and 11.7 GHz/\(\upmu\)m. Further, when the analyte layer thickness is 10 \(\upmu\)m, and the THz wave is vertically incident, too, by changing the RI in the range of 1–2, the average refractive index sensitivity of the two absorption peaks is 163 and 488 GHz/RIU with the figure of merit (FOM) are 5.09 and 9.04, respectively. Furthermore,we modified the structure to improve the refractive index sensitivity of the two absorption peaks to 319 and 1015 GHz/RIU. Therefore, this absorber can be used in nondestructive testing due to the above characteristics.

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Funding

This work was supported in part by the Natural Science Foundation of Guangxi (2021GXNSFBA196081), in part by the National Natural Science Foundation of China (62063003), in part by the Guangxi Key Laboratory of Automatic Detecting Technology and Instruments (YQ23107) and in part by the by the Guangxi postdoctoral special fund.

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Author notes

  1. Chengfeng Liu, Chuanpei Xu, Zhi Li, Yuee Wang and Yifu Peng are contributed equally to this work.

Authors and Affiliations

  1. Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of Electronic Technology, Dongjiang Street, Guilin, 541004, Guangxi, People’s Republic of China

    Huo Zhang, Chengfeng Liu, Chuanpei Xu, Yuee Wang & Yifu Peng

  2. Guilin University of Aerospace Technology, Dongjiang Street, Guilin, 541004, Guangxi, People’s Republic of China

    Zhi Li

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  1. Huo Zhang
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Contributions

Huo Zhang: Supervision, Software, Writing-review and editing. Chengfeng Liu: Data Simulation, principle analysis, data curation, and original writing. Chuanpei Xu: Writing-review and editing. Zhi Li: Writing-review and editing. Yuee Wang: Software, principle analysis. Yifu Peng: Data Simulation, data curation.

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Correspondence to Huo Zhang.

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Zhang, H., Liu, C., Xu, C. et al. A dual-band terahertz metamaterial sensor with high Q-factor and sensitivity. Opt Quant Electron 55, 1126 (2023). https://doi.org/10.1007/s11082-023-05456-7

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