太赫兹辐射
材料科学
宽带
线极化
极化(电化学)
光电子学
谐振器
二氧化二钒
光学
薄膜
物理
纳米技术
化学
物理化学
激光器
作者
Dexian Yan,Qinyin Feng,Ziwei Yuan,Meng Miao,Xiangjun Li,Guohua Qiu,Jining Li
出处
期刊:Chinese Physics B
[IOP Publishing]
日期:2022-01-01
卷期号:31 (1): 014211-014211
被引量:33
标识
DOI:10.1088/1674-1056/ac05a7
摘要
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 (VO 2 ). 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 VO 2 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 °C) and VO 2 becomes a metal, the metasurface transforms into a wideband linear-to-circular polarization converter composed of the gold CSRR, first PI layer, and continuous VO 2 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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