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A Tunable Perfect THz Metamaterial Absorber with Three Absorption Peaks Based on Nonstructured Graphene

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Abstract

In this paper, a graphene-based tunable multi-band terahertz absorber is proposed and numerically investigated. The proposed absorber can achieve perfect absorption within both sharp and ultra-broadband absorption spectra. This wide range of absorption is gathered through a unique combination of periodically cross- and square-shaped dielectrics sandwiched between two graphene sheets; the latter enables it to offer more absorption in comparison with the traditional single-layer graphene structures. The aforementioned top layer is mounted on a gold plate separated by a Topas layer with zero volume loss. Furthermore, in our proposed approach, we investigated the possibility of changing the shapes and sizes of the dielectric layers instead of the geometry of the graphene layers to alleviate the edge effects and manufacturing complications. In numerical simulations, parameters, such as graphene Fermi energy and the dimensions of the proposed dielectric layout, have been optimally tuned to reach perfect absorption. We have verified that the performance of our dielectric layout called fishnet, with two widely investigated dielectric layouts in the literature (namely, cross-shaped and frame-and-square). Our results demonstrate two absorption bands with near-unity absorbance at frequencies of 1.6–2.3 and 4.2–4.9 THz, with absorption efficiency of 98% in 1.96 and 4.62 THz, respectively. Moreover, a broadband absorption in the 7.77–9.78 THz is observed with an absorption efficiency of 99.6% that was attained in 8.44–9.11 THz. Finally, the versatility provided by the tunability of three operation bands of the absorber makes it a great candidate for integration into terahertz optoelectronic devices.

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The data and materials of this manuscript are available after publishing.

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The simulation files are available for reviewers upon request.

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Funding

This article has no funding. The authors received no financial support for the research, authorship, and/or publication of this article.

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Authors and Affiliations

  1. Faculty of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran

    Mahdi Rahmanshahi, Soheil Noori Kourani, Saeed Golmohammadi, Hamed Baghban & Hamid Vahed

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  1. Mahdi Rahmanshahi
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  2. Soheil Noori Kourani
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  3. Saeed Golmohammadi
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  4. Hamed Baghban
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  5. Hamid Vahed
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Contributions

All of the authors have the same contribution percentages in this manuscript. M. Rahmanshahi and S. Noori Kourani have performed the simulations, S. Golmohammadi, H. Baghban, and H. Vahed have contributed in discussions and writing the materials. All co-authors have seen and agree with the contents of the manuscript and they certify that the submission is original work and is not under review at any other publication.

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Correspondence to Mahdi Rahmanshahi.

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Rahmanshahi, M., Noori Kourani, S., Golmohammadi, S. et al. A Tunable Perfect THz Metamaterial Absorber with Three Absorption Peaks Based on Nonstructured Graphene. Plasmonics 16, 1665–1676 (2021). https://doi.org/10.1007/s11468-021-01432-7

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  • DOI: https://doi.org/10.1007/s11468-021-01432-7

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