Abstract
Broadband absorber at high terahertz frequency is highly required for applications in imaging, detecting, electromagnetic stealth. Although intensive investigations of the broadband absorber have been taken, the challenges still exist both in design and fabrication of an ultra-broadband absorber at high frequency. Herein, a three-layered structure metamaterial has been designed to realize an ultra-broadband terahertz absorber covering 3.94–9.98 THz (6.04 THZ) at the absorption above 80%, and the absorption bandwidth can be increased to 7.64THz (2.34–9.98 THz) by rotating the absorber. Upon on the simulations, the proposed absorber exhibits insensitive to the TM and TE polarization, it means the absorption effect is almost consistent in different polarization modes, the proposed absorber is significant in the practical application. Nevertheless, the absorption bandwidth reduces a little bit to 5.05 THz (absorption > 60%) as β increases to 45°.
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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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Acknowledgements
This work was supported by the National Key R&D Program of China (Grant No. 2019YFA0705201), National Natural Science Foundation of China (Grant No. 61771156), Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No.51521003), Project funded by China Postdoctoral Science Foundation (CA24407217).
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Li, T., Chen, H., Zhang, F. et al. An ultra-broadband terahertz absorber at high terahertz frequency. Opt Quant Electron 54, 859 (2022). https://doi.org/10.1007/s11082-022-04133-5
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DOI: https://doi.org/10.1007/s11082-022-04133-5