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Design of graphene-based broadband metamaterial absorber with circuit analysis approach for Terahertz Region applications

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Abstract

In this article, a compact metamaterial absorber exhibiting more than 80% absorption over a broad operating band ranging from 5.63 to 5.88 THz (250 GHz) is proposed for terahertz applications using circuit analysis approach. The novelty lies in designing a broadband absorber which features tunability while maintaining low profile dimensions (10 µm \(\times \) 10 µm). Concentric square ring-based graphene patches have been leveraged for providing metal-free absorption mechanism. The chemical potential of graphene has been varied from 0.4 to 1.0 eV to facilitate tunability in absorption. The proposed absorber has been rigorously analyzed with an Equivalent Circuit Model (ECM). The results obtained through full wave simulation and ECM approach are in good agreement and confirms the operation of the absorber at 5.75 THz. The peak absorption value of 99.96% is obtained at 5.75 THz. The proposed broadband terahertz absorber is suitable for sensing, imaging, biotechnology, polarization conversion, high-speed THz communications and food processing applications.

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Data availability

All the data generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Code availability

Implemented through computer simulation technology (CST) software.

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Acknowledgements

The authors are thankful to the Deanship of Scientific Research at Najran University for supporting this work under the Research Groups Funding program grant code (NU/RG/SERC/12/3). Moreover, the authors extend their appreciation to BVRIT HYDERABAD College of Engineering for Women, Hyderabad, India.

Funding

This research work received technical support from the Deanship of Scientific Research at Najran University under the Research Groups Funding program grant code (NU/RG/SERC/12/3).

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, BVRIT HYDERABAD College of Engineering for Women, Bachupally, Telangana, India

    K. Vasu Babu

  2. School of Electronics Engineering (SENSE), Vellore Institute of Technology, Chennai, India

    Priyanka Das

  3. Department of Electronics and Communication Engineering, IMPS College of Engineering and Technology, Malda, W.B., 732103, India

    Sudipta Das

  4. Electrical Engineering Department, College of Engineering, Najran University, Najran, Saudi Arabia

    Abdulkarem H. M. Almawgani & Adam R. H. Alhawari

  5. Department of Electrical and Computer Engineering, University of Houston, Houston, TX, 77204, USA

    Tanvir Islam

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  1. K. Vasu Babu
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  2. Priyanka Das
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  3. Sudipta Das
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  6. Adam R. H. Alhawari
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Contributions

All authors contributed to the study, conception, design and simulations. Data collection, analysis, and simulation were performed by KVB, PD, and SD. Additional input to analysis, model improvement, and simulation was given by AHMA, TI, ARHA. All authors contributed to complete the writing and presentation of the whole manuscript. All the authors have read and approved the final manuscript.

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Correspondence to K. Vasu Babu.

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Babu, K.V., Das, P., Das, S. et al. Design of graphene-based broadband metamaterial absorber with circuit analysis approach for Terahertz Region applications. Opt Quant Electron 55, 1188 (2023). https://doi.org/10.1007/s11082-023-05489-y

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