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Multiband, polarization-insensitive absorber operating in the terahertz range

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Abstract

In this study, we analyze a thin-size metasurface-based multiband terahertz (THz) absorber with a top layer comprised of nickel-made circled plus-shaped resonators. The geometric structure of the proposed absorber consists of subwavelength size and periodically arranged nickel resonators at the top followed by substrate SiO2 film, and the silver layer at the bottom features several high absorption bands within the 1–5-THz operating range. The proposed multiband THz absorber shows excellent absorption characteristics with perfect absorptivity, 100% at 1.5 THz, 98% at 3.2 THz, 96% at 3.72 THz, and 100% at 4.26 THz, respectively. The symmetry in the top-layer design of the unit cell shows persistence to incident waves with different polarization and makes this device independent of variation in the polarization of the waves. Besides that, surface current density analysis of the absorber illustrates that high absorption bands are achieved due to the existence of strong electric resonance in the unit cell structure. It is believed that the proposed multiband terahertz absorber with high absorption characteristics and polarization-independent behavior can be used in the field of THz shielding, THz detectors and emitters, THz sensing, and thermal imaging.

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Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Acknowledgments

This work was partially supported by the Higher Education Commission Pakistan (HEC) under [grant number 20-14992/NRPU/R&D/HEC/2021 2021].

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No funding was obtained for this study.

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Authors and Affiliations

  1. Department of Electrical Engineering, College of Engineering, Jouf University, 72388, Sakaka, Saudi Arabia

    Ammar Armghan

  2. Department of Computer Science, Cihan University Sulaimaniya, Sulaimaniya, Kurdistan Region, 46001, Iraq

    Lway Faisal Abdulrazak

  3. Department of Electrical and Computer Engineering, COMSATS University Islamabad, Islamabad, Pakistan

    Muhammad Abuzar Baqir & Muhammad Saqlain

  4. Department of Mechanical Engineering, Jouf University, 72388, Sakaka, Saudi Arabia

    Hammad Al-Shammari

Authors
  1. Ammar Armghan
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  2. Lway Faisal Abdulrazak
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  3. Muhammad Abuzar Baqir
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  4. Muhammad Saqlain
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  5. Hammad Al-Shammari
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Contributions

AA, LFA, and MAB conceived idea and design of the presented work. MS and HA-S put forward theory and worked out results. MAB and MS verified the analytical methods employed. AA and LFA concluded the results with support of MAB and MS. AA, LFA, MAB, and MS wrote the manuscript with support of LFA and HA-S. All authors deliberated the results and contributed to the final manuscript.

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Correspondence to Muhammad Saqlain.

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Armghan, A., Abdulrazak, L.F., Baqir, M.A. et al. Multiband, polarization-insensitive absorber operating in the terahertz range. J Comput Electron (2024). https://doi.org/10.1007/s10825-024-02151-y

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