| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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High efficiency of broadband transmissive metasurface terahertz polarization converter |
| Qiangguo Zhou(周强国)1,4, Yang Li(李洋)1,4, Yongzhen Li(李永振)1,4, Niangjuan Yao(姚娘娟)1,4, and Zhiming Huang(黄志明)1,2,3,4,5,† |
1 State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;
2 Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China;
3 Institute of Optoelectronics, Fudan University, Shanghai 200438, China;
4 University of Chinese Academy of Sciences, Beijing 100049, China;
5 Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China |
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Abstract Terahertz wave is between microwave and infrared bands in the electromagnetic spectrum with the frequency range from 0.1 THz to 10 THz. Controlling and processing of the polarization state in terahertz wave are the focus due to its great influence on the characteristics. In this paper, a transmissive metasurface terahertz polarization converter is designed in 3D structure with an upper surface of ruler-like rectangular, an intermediate dielectric layer and a lower surface of metal grid wires. Numerical simulations of the converter show that the polarization conversion ratio (PCR) is above 99.9% at 0.288 THz-1.6 THz, the polarization rotation angle (PRA) is close to 90° at 0.06 THz-1.4 THz, and the ellipticity angle (EA) is close to 0° at 0.531 THz-1.49 THz. The origin of the efficient polarization conversion is explained by analyzing the electric field intensity, magnetic field intensity, surface current, electric field energy density, and magnetic field energy density distributions of the converter at 1.19 THz and 0.87 THz, which are consistent with the energy transmittance and transmittance coefficient. In addition, the effects of different thickness and material of intermediate layer, thickness of upper surface material, polarized wave incidence angle, and metasurface materials on the performance of the polarization converter are discussed, and how they affect the conversion performance of the polarization converter are also explained. Our results provide a strong theoretical basis and technical support to develop high performance transmission-type terahertz polarization converters, and play an important role to promote the development of terahertz science and technology.
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Received: 08 March 2022
Revised: 19 April 2022
Accepted manuscript online: 07 May 2022
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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 Fundation (Grant Nos. 12134016 and 61625505), Chinese Academy of Sciences (Grant No. ZDBS-LY-JSC025), Sino– Russia International Joint Laboratory of Terahertz Materials and Devices (Grant No. 18590750500), and Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01). |
Corresponding Authors:
Zhiming Huang
E-mail: zmhuang@mail.sitp.ac.cn
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Cite this article:
Qiangguo Zhou(周强国), Yang Li(李洋), Yongzhen Li(李永振), Niangjuan Yao(姚娘娟), and Zhiming Huang(黄志明) High efficiency of broadband transmissive metasurface terahertz polarization converter 2023 Chin. Phys. B 32 024201
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