Highly–efficient polarization–insensitive antireflection metagrating for terahertz waves

Xinyu Ma, Yanfeng Li, Yongchang Lu, Jiaguang Han, Xixiang Zhang, Weili Zhang

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)125188
JournalOptics Communications
Volume461
DOIs
StatePublished - Dec 26 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2950
Acknowledgements: 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).

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