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

被引：0
作者：
Yongzhi Cheng
Rongzhou Gong
Lin Wu
机构：
[1] Wuhan University of Science and Technology,School of Information Science and Engineering
[2] Huazhong University of Science and Technology,School of Optical and Electronic Information
[3] Nanyang Technological University,School of Electrical and Electronic Engineering
来源：
Plasmonics | 2017年 / 12卷
关键词：
Split-disk structure; Composite metamaterial; Polarization conversion; Asymmetric transmission;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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.
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页码：1113 / 1120
页数：7
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