Abstract
We propose an ultra-thin multiband terahertz metamaterial absorber, whose thickness is only 3.8 μm. Simulation results show that we can get four narrow absorption peaks with near-perfect absorption in the 4.5 THz-6.0 THz frequency range. The resonance absorption mechanism is interpreted by the electromagnetic field energy distributions at resonance frequency. Moreover, we also analyze the sensing performances of the absorber in the refractive index and the thickness of the analyte. The refractive index and thickness sensitivities of the sensor are 0.471 THz/RIU, 0.4 THz/μm and the FOMs are 8.887RIU−1, 8.163 μm−1,respectively. The absorber has potential applications in photodetector, multi-spectral imaging and biosensors.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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This work was supported by the Education Commission Research Project of Tianjin (Grant No. 2018KJ213).
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Jinjun Bai, Wei Shen, Shasha Wang, Meilan Ge, Tingting Chen, Pengyan Shen and Shengjiang Chang. The first draft of the manuscript was written by Wei Shen and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Bai, J., Shen, W., Wang, S. et al. An ultra-thin multiband terahertz metamaterial absorber and sensing applications. Opt Quant Electron 53, 506 (2021). https://doi.org/10.1007/s11082-021-03180-8
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DOI: https://doi.org/10.1007/s11082-021-03180-8