Abstract
The polarization converters are imperative components in modern optical system, but its functionality is usually statically adjustable due to the constraint of materials. Herein, a Babinet InSb metasurface composed of C-shape resonators is proposed with its anisotropic amplitudes and phases of reflected light along two orthogonal axes can be tailored by adjusting external temperature in the THz range. The simulation results show that designer metasurface is a 90° polarization rotator with the polarization conversion ratio up to 97% at 1.36 THz when temperature T = 298 K. By tuning the external temperature from 280 to 320 K, the polarization conversion functionality can be realized or eliminated near form 1.1 THz to 1.7 THz. The regulation mechanism of the proposed tunable converter is attributed to the electromagnetic coupling pattern between the upper C-shape metasurface and the metallic substrate at different external temperature. The results appear to hold promise for wave retarder devices and modern optical systems.
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This manuscript has no associated data or the data will not be deposited. [Authors' comment: All data generated or analyzed during this study are included in this published article.]
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Acknowledgements
Author Qian He and Xiongjun Shang acknowledge the Natural Science Foundation of Hunan province for the research fellowship. Author Chenlei Xu, Kaipeng Gao, Yuanhang Chen and Xiongjun Shang acknowledge Hunan University Students Innovation and Entrepreneurship Training program for the research fellowship.
Funding
This work was supported by the Natural Science Foundation of Hunan province under Grant Nos. 2020JJ5565, 2020JJ5601; Hunan University Students Innovation and Entrepreneurship Training program under Grant No. S2021105360055.
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JO and CX developed the theory and performed the simulations. XS supervised the findings of this work. All authors discussed the results and contributed to the final version of the manuscript.
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Ouyang, J., Xu, C., Yang, Y. et al. Thermally tunable THz polarization converter based on Babinet-inverted metasurface. Eur. Phys. J. D 76, 124 (2022). https://doi.org/10.1140/epjd/s10053-022-00455-x
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DOI: https://doi.org/10.1140/epjd/s10053-022-00455-x