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Double-ridge arrays metasurface for multifunctional splitter at terahertzs

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Abstract

In this paper, unlike many researches that focus on beam splitters based on gratings with symmetrical structures, an asymmetric grating with double-groove structure is proposed. Based on the double-groove grating, multi-port beam splitters including dual-port, three-port, and four-port, under normal incidence working at terahertz frequency are designed for both transverse-electric and transverse-magnetic polarizations. Rigorous couple-wave analysis and simulated annealing algorithm are employed to get the optimal parameters of the grating and accelerate the computing process. For the purpose of understanding the phenomenon of the beam incident, the finite element method is also applied to get the simulation result. It is proven that the proposed beam splitters all present great efficiency and uniformity on the energy distribution. High manufacturing tolerance of the beam splitters is also analyzed, which allows for greater flexibility in the fabrication process. Compared with beam splitters based on single-groove grating, multi-port beam splitters based on double grooves show great performance and universality.

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Data availability

The data analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work is supported by the Key Laboratory of Biomedical Imaging Science and System, Chinese Academy of Sciences.

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Authors and Affiliations

  1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, 510006, China

    Liqun Liu, Bo Wang, Zherui Cui, Hongwei Zhan & Jinjie Li

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  1. Liqun Liu
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  2. Bo Wang
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  3. Zherui Cui
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  4. Hongwei Zhan
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  5. Jinjie Li
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Contributions

LL: Data curation, Formal analysis, Validation, Investigation, Writing—original draft. BW: Conceptualization, Methodology, Supervision, Project administration, Writing—review and editing. ZC: Formal analysis. HZ: Investigation. JL: Investigation.

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Correspondence to Bo Wang.

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Liu, L., Wang, B., Cui, Z. et al. Double-ridge arrays metasurface for multifunctional splitter at terahertzs. Appl. Phys. B 130, 32 (2024). https://doi.org/10.1007/s00340-023-08168-8

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