中国物理B ›› 2020, Vol. 29 ›› Issue (11): 114209-.doi: 10.1088/1674-1056/abb661

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Xiao-Fei Jiao(焦晓飞)1,2,3, Zi-Heng Zhang(张子恒)1,2,3, Yun Xu(徐云)1,2,3, Guo-Feng Song(宋国峰)1,2,3,†()   

  • 收稿日期:2020-07-17 修回日期:2020-08-14 接受日期:2020-09-09 出版日期:2020-11-05 发布日期:2020-11-03

Efficient and multifunctional terahertz polarization control device based on metamaterials

Xiao-Fei Jiao(焦晓飞)1,2,3, Zi-Heng Zhang(张子恒) 1,2,3, Yun Xu(徐云)1,2,3, and Guo-Feng Song(宋国峰)1,2,3, †   

  1. 1 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
    2 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
    3 Beijing Key Laboratory of Inorganic Stretchable and Flexible Information Technology, Beijing 100083, China
  • Received:2020-07-17 Revised:2020-08-14 Accepted:2020-09-09 Online:2020-11-05 Published:2020-11-03
  • Contact: Corresponding author. E-mail: sgf@semi.ac.cn
  • Supported by:
    the National Key Research and Development Plan, China (Grant No. 2016YFB0402402), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB43010000), the National Key Research and Development Project, China (Grant No. 2016YFB0400601), the National Basic Research Program of China (Grant No. 2015CB351902), the National Science and Technology Major Project, China (Grant No. 2018ZX01005101- 010), the National Natural Science Foundation of China (Grant Nos. 61835011and U1431231), the Key Research Projects of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDY-SSW-JSC004), and the Beijing Science and Technology Projects (Grant No. Z151100001615042).

Abstract:

Terahertz polarization devices are an important part of terahertz optical systems. Traditional terahertz polarization devices rely on birefringent crystals, and their performances are limited by the material structures. In this work, we theoretically demonstrate that the metamaterial consisting of the medium and the periodic metal band embedded in the medium can control broadband polarization effectively. The transmission length of the subwavelength waveguide mode gives rise to a broadband transmission peak. The resonant cavity structure formed by the dielectric layer and the waveguide layer possesses a high transmission efficiency. By optimizing the metamaterial structure parameters, we design a high-efficient (>90%) quarter-wave plate over a frequency range of 0.90 THz–1.10 THz and a high-efficient (>90%) half-wave plate over a frequency range of 0.92 THz–1.02 THz. Besides, due to the anisotropy of the structure, the metamaterials with the same structural parameters can achieve the function of the polarized beam splitting with an efficiency of up to 99% over a frequency range of 0.10 THz–0.55 THz. Therefore, the designed metamaterial has a multifunctional polarization control effect, which has potential applications in the terahertz integrated polarization optical system.

Key words: terahertz, metamaterials, waveguide transmission