中国物理B ›› 2021, Vol. 30 ›› Issue (1): 14201-.doi: 10.1088/1674-1056/abb662

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  • 收稿日期:2020-06-08 修回日期:2020-08-02 接受日期:2020-09-09 出版日期:2020-12-17 发布日期:2021-01-04

Broadband asymmetric transmission for linearly and circularly polarization based on sand-clock structured metamaterial

Tao Fu(傅涛)1,†, Xing-Xing Liu(刘兴兴)1, Guo-Hua Wen(文国华)2, Tang-You Sun(孙堂友)1, Gong-Li Xiao(肖功利)1, and Hai-Ou Li(李海鸥)1   

  1. 1 Guangxi Key Laboratory of Precision Navigation Technology and Application, Guilin University of Electronic Technology (GUET), Guilin 541004, China; 2 Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Ave, Kowloon, Hong Kong SAR, China
  • Received:2020-06-08 Revised:2020-08-02 Accepted:2020-09-09 Online:2020-12-17 Published:2021-01-04
  • Contact: †Corresponding author. E-mail: ft85@guet.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 11965009, 61874036, 61805053, and 61764001), the Natural Science Foundation of Guangxi Zhuang Autonomous Region, China (Grant Nos. 2018JJA170010 and 2018GXNSFAA281193), and the Innovation Project of GUET Graduate Education (Grant No. 2020YCXS019).

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Abstract: We proposed a sandwich structure to realize broadband asymmetric transmission (AT) for both linearly and circularly polarized waves in the near infrared spectral region. The structure composes of a silica substrate and two sand-clock-like gold layers on the opposite sides of the substrate. Due to the surface plasmons of gold, the structure shows that the AT parameters of linearly and circularly polarized waves can reach 0.436 and 0.403, respectively. Meanwhile, a broadband property is presented for the AT parameter is over 0.3 between 320 THz and 340 THz. The structure realizes a diode-like AT for linearly wave in forward and circularly wave in backward, respectively. The magnetic dipoles excited by current in the two gold layers contribute to the broadband AT. The current density in top and bottom metallic layers illustrates the mechanism of the polarization conversion for broadband AT in detail.

Key words: asymmetric transmission, metasurface, polarization conversion, trerahertz, broadband, electromagnetic wave, near-infrared

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.25.Ja (Polarization) 42.79.Ci (Filters, zone plates, and polarizers) 81.05.Xj (Metamaterials for chiral, bianisotropic and other complex media)