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    Highly–efficient polarization–insensitive antireflection metagrating for terahertz waves

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    highly efficient.pdf
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    Description:
    Accepted manuscript
    Embargo End Date:
    2021-12-26
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    Type
    Article
    Authors
    Ma, Xinyu
    Li, Yanfeng
    Lu, Yongchang
    Han, Jiaguang
    Zhang, Xixiang cc
    Zhang, Weili
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2016-CRG5-2950
    Date
    2019-12-26
    Online Publication Date
    2019-12-26
    Print Publication Date
    2020-04
    Embargo End Date
    2021-12-26
    Permanent link to this record
    http://hdl.handle.net/10754/660962
    
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    Abstract
    A simple approach based on effective medium theory is proposed and applied to evaluate and design a polarization–insensitive antireflection metagrating for terahertz waves. The period of the grating is subwavelength such that there is only one propagating mode within the grating region and high–order diffraction orders do not exist. Thus, the grating region is treated as a homogeneous medium and the whole problem can be modelled as a Fabry–Perot resonator, whose thickness then determines the transmittance. The transmittances of the fabricated device for TE and TM waves at 0.87 THz are measured to be 84% and 95% for an air–silicon surface, respectively. This simple metagrating design will find important applications in antireflection scenarios in the terahertz frequency range.
    Citation
    Ma, X., Li, Y., Lu, Y., Han, J., Zhang, X., & Zhang, W. (2020). Highly–efficient polarization–insensitive antireflection metagrating for terahertz waves. Optics Communications, 461, 125188. doi:10.1016/j.optcom.2019.125188
    Sponsors
    The authors are grateful to Fan Yang of Tsinghua University for valuable discussions. This work was supported by the National Key Research and Development Program of China (GrantNo. 2017YFA0701004), the Tianjin Municipal Fund for Distinguished Young Scholars (Grant No. 18JCJQJC45600), the National Natural Science Foundation of China (Grant Nos. 61775159, 61420106006, 61427814, 61422509, 61735012, and 61505146), and King Abdullah University of Science and Technology (KAUST), Saudi Arabia Office of Sponsored Research (OSR) (Grant No. OSR-2016-CRG5-2950).
    Publisher
    Elsevier BV
    Journal
    Optics Communications
    DOI
    10.1016/j.optcom.2019.125188
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0030401819311642
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.optcom.2019.125188
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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