| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Ultra-broadband and wide-angle reflective terahertz polarization conversion metasurface based on topological optimization |
| Ya-Jie Zhang(张亚杰)1, Chao-Long Li(李潮龙)1, Jia-Qi Luan(栾迦淇)1, Ming Zhao(赵茗)2, Ding-Shan Gao(郜定山)2, and Pei-Li Li(李培丽)1,† |
1 Faculty of Electrical and Optical Engineering, Nanjing University of Posts and Communications, Nanjing 210023, China;
2 Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract Terahertz polarization conversion devices have significant potential applications in various fields such as terahertz imaging and spectroscopy. In this paper, we utilize genetic algorithms to topologically optimize the metasurface unit cells and design a reflective linear polarization conversion metasurface with ultra-broadband and wide-angle characteristics. By partitioning the metallic pattern layer into quadrants, the encoding length is effectively reduced, resulting in a shorter optimization time. The research results indicate that the converter possesses a polarization conversion efficiency ratio higher than 90% and a relative bandwidth ratio of 125% in a range of 0.231-0.995 THz. Meanwhile, it can maintain excellent polarization conversion properties when the incident angle of terahertz waves is less than 45$^\circ$ and the polarization angle is less than 15$^\circ$, demonstrating excellent practicality. New insights are provided for the design of terahertz wide-angle ultra-wideband polarization conversion devices, and the proposed metasurfce has potential applications in terahertz polarization imaging, spectroscopy and communication fields.
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Received: 23 April 2024
Revised: 13 June 2024
Accepted manuscript online: 02 July 2024
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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| Fund: Project supported by the National Natural Science Foundation of China and the Open Project Program of Wuhan National Laboratory for Optoelectronics (Grant No. 2022WNLOKF012) |
Corresponding Authors:
Pei-Li Li
E-mail: lipl@njupt.edu.cn
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Cite this article:
Ya-Jie Zhang(张亚杰), Chao-Long Li(李潮龙), Jia-Qi Luan(栾迦淇), Ming Zhao(赵茗), Ding-Shan Gao(郜定山), and Pei-Li Li(李培丽) Ultra-broadband and wide-angle reflective terahertz polarization conversion metasurface based on topological optimization 2024 Chin. Phys. B 33 104210
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