| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Wideband switchable dual-functional terahertz polarization converter based on vanadium dioxide-assisted metasurface |
| De-Xian Yan(严德贤)1,2,4,†, Qin-Yin Feng(封覃银)1,2, Zi-Wei Yuan(袁紫微)1,2, Miao Meng(孟淼)1,2, Xiang-Jun Li(李向军)1,2, Guo-Hua Qiu(裘国华)1,2, and Ji-Ning Li(李吉宁)3 |
1 Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, China;
2 Center for THz Research, China Jiliang University, Hangzhou 310018, China;
3 College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, China;
4 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China |
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Abstract The terahertz technology has attracted considerable attention because of its potential applications in various fields. However, the research of functional devices, including polarization converters, remains a major demand for practical applications. In this work, a reflective dual-functional terahertz metadevice is presented, which combines two different polarization conversions through using a switchable metasurface. Different functions can be achieved because of the insulator-to-metal transition of vanadium dioxide (VO2). At room temperature, the metadevice can be regarded as a linear-to-linear polarization convertor containing a gold circular split-ring resonator (CSRR), first polyimide (PI) spacer, continuous VO2 film, second PI spacer, and gold substrate. The converter possesses a polarization conversion ratio higher than 0.9 and a bandwidth ratio of 81% in a range from 0.912 THz to 2.146 THz. When the temperature is above the insulator-to-metal transition temperature (approximately 68 ℃) and VO2 becomes a metal, the metasurface transforms into a wideband linear-to-circular polarization converter composed of the gold CSRR, first PI layer, and continuous VO2 film. The ellipticity is close to -1, while the axis ratio is lower than 3 dB in a range of 1.07 THz-1.67 THz. The metadevice also achieves a large angle tolerance and large manufacturing tolerance.
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Received: 12 April 2021
Revised: 14 May 2021
Accepted manuscript online: 27 May 2021
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PACS:
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81.05.Xj
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(Metamaterials for chiral, bianisotropic and other complex media)
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87.50.U-
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42.81.Gs
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(Birefringence, polarization)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62001444), the Natural Science Foundation of Zhejiang Province, China (Grant No. LQ20F010009), the Basic Public Welfare Research Project of Zhejiang Province, China (Grant No. LGF19F010003), and the State Key Laboratory of Crystal Materials, Shandong University, China (Grant No. KF1909). |
Corresponding Authors:
De-Xian Yan
E-mail: yandexian1991@163.com
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Cite this article:
De-Xian Yan(严德贤), Qin-Yin Feng(封覃银), Zi-Wei Yuan(袁紫微), Miao Meng(孟淼), Xiang-Jun Li(李向军), Guo-Hua Qiu(裘国华), and Ji-Ning Li(李吉宁) Wideband switchable dual-functional terahertz polarization converter based on vanadium dioxide-assisted metasurface 2022 Chin. Phys. B 31 014211
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