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

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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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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant Nos. U1435209, and 61605147) and the Youth science and technology backbone cultivation plan project of the Wuhan University of Science and Technology (Grant No. 2016xz010).

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Authors and Affiliations

  1. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China

    Yongzhi Cheng

  2. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China

    Yongzhi Cheng & Rongzhou Gong

  3. School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    Lin Wu

Authors
  1. Yongzhi Cheng
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  2. Rongzhou Gong
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  3. Lin Wu
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Correspondence to Yongzhi Cheng.

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Cheng, Y., Gong, R. & Wu, L. Ultra-Broadband Linear Polarization Conversion via Diode-Like Asymmetric Transmission with Composite Metamaterial for Terahertz Waves. Plasmonics 12, 1113–1120 (2017). https://doi.org/10.1007/s11468-016-0365-4

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  • DOI: https://doi.org/10.1007/s11468-016-0365-4

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