期刊
CHINESE PHYSICS B
卷 31, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1056/ac05a7
关键词
metasurface; polarization conversion; vanadium dioxide; dual-functional
资金
- National Natural Science Foundation of China [62001444]
- Natural Science Foundation of Zhejiang Province, China [LQ20F010009]
- Basic Public Welfare Research Project of Zhejiang Province, China [LGF19F010003]
- State Key Laboratory of Crystal Materials, Shandong University, China [KF1909]
Terahertz technology has gained significant attention due to its potential applications in various fields. This study presents a reflective dual-functional terahertz metadevice that combines two different polarization conversions using a switchable metasurface. The metadevice can function as a linear-to-linear polarization converter and a wideband linear-to-circular polarization converter, with high conversion ratios and large bandwidths.
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 degrees C) 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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