Ultra-Broadband Linear Polarization Conversion via Diode-Like Asymmetric Transmission with Composite Metamaterial for Terahertz Waves

作者：Cheng, Yongzhi^*; Gong, Rongzhou; Wu, Lin

来源：Plasmonics, 2017, 12(4): 1113-1120.

DOI：10.1007/s11468-016-0365-4

• Split-disk structure
• Composite metamaterial
• Polarization conversion
• Asymmetric transmission

In this paper, a tri-layer metamaterial composed of a split-disk structure array sandwiched with two layers of twisted sub-wavelength metal grating is proposed and investigated numerically in terahertz region. The numerical results exhibit that linear polarization conversion via diode-like asymmetric transmission for terahertz waves within ultra-broadband frequency range is achieved due to Fabry-Perot-like resonance. In our design, the conversion polarization transmission coefficient for normal incidence is greater than 90 % in the range of 0.23-1.17 THz, equivalent to 134.3 % relative bandwidth. The physical mechanism of the broadband linear polarization conversion effect is further illustrated by simulated electrical field distributions.

• 出版日期2017-8
• 单位武汉科技大学; 华中科技大学