Abstract-Asymmetric transmission of linearly polarized waves in terahertz chiral metamaterials

Shenying Fang1,a), Kang Luan2,a), Hui Feng Ma2, Wenjin Lv1, Yuxiang Li1,b), Zheng Zhu1, Chunying Guan1, Jinhui Shi1,3,b), and Tie Jun Cui

http://aip.scitation.org/doi/abs/10.1063/1.4974477

We experimentally demonstrate the asymmetric transmission of linearly polarized waves in a multilayer chiral metamaterial in the terahertz (THz) regime. The chiral metamaterial is constructed by two stacked orthogonal metallic layers embedded in polyimide dielectric layers. Simulated and measured results show that the proposed multilayer chiral metamaterial can achieve dual-band direction-dependent cross-polarization conversions for both x- and y-polarized THz waves. The polarized wave passing through the metamaterial will be converted into its orthogonal polarization state, while the same polarized wave is blocked along the reversed propagation direction. In addition, the asymmetric transmission band may be effectively engineered to other frequencies by slightly adjusting the gap width. We believe that our findings are beneficial in manipulating the polarization state of THz waves and exploring polarization-sensitive THz devices.

Abstract-Free-Standing Metasurfaces for High-Efficiency Transmitarrays for Controlling Terahertz Waves

1. Shuo Liu^1,2, 
2. Qiang Cheng^1,3, 
3. Quan Xu⁴,
4. Tian Qi Wang^1,2, 
5. Liang Liang Du⁴, 
6. Kang Luan^1,2, 
7. Yue Hong Xu⁴, 
8. Di Bao^1,2, 
9. Xiao Jian Fu^1,2, 
10. Jia Guang Han⁴, 
11. Wei Li Zhang^3,4 and
12. Tie Jun Cui^1,3,*

Article first published online: 11 DEC 2015

DOI: 10.1002/adom.201500519

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

http://onlinelibrary.wiley.com/doi/10.1002/adom.201500519/abstract;jsessionid=1E8BB761E0D01A393F30C1F518B17754.f01t04?userIsAuthenticated=false&deniedAccessCustomisedMessage=

An ultrathin free-standing metasurface is proposed to bend the normally incident terahertz wave to an anomalous direction, or to focus plane wave to a point, with high efficiency. The flexibility and endurable nature of the proposed transmitarray make it a promising candidate for various THz applications such as time-domain system or THz imaging devices.