Ultra-Broadband Linear Polarization Conversion via Diode-Like Asymmetric Transmission with Composite Metamaterial for Terahertz Waves |
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Authors: | Cheng Yongzhi Gong Rongzhou Wu Lin |
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Institution: | 1.School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China ;2.School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China ;3.School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore ; |
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Abstract: | 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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