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A tunable dual-band THz absorber based on graphene sheet and ribbons

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Abstract

A tunable terahertz dual band absorber consisted of graphene ribbon arrays and a graphene sheet with near-unity absorption is proposed and studied in this letter. With the coupling enhancement of graphene ribbon and graphene sheet, a perfect dual band absorber with absorption over 99% at 3.67 THz and 5.88 THz is achieved. Moreover, the principal of the coupling enhancement is analyzed. By optimizing the parameters of the structure, not only the absorption can be enhanced, but also the center of absorbing frequency could be shifted. Another approach to adjust the absorber–tuning the chemical potential of graphene which is more convenient and timely is investigated. Furthermore, the sensing of the refractive index is emulated by changing the refractive index of the medium on the top. Results show a broad application prospect of the absorber proposed in this paper.

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Acknowledgements

This work was supported by 2016 Zhejiang Provincial Natural Science Foundation under Grant No. LY16F010010, in part by 2015 Zhejiang Province Public Welfare of International Cooperation Project under Grant No. 2015C34006 and in part by 2016 Zhejiang Province Public Welfare of International Cooperation Project under Grant No. 2016C34003.

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Authors and Affiliations

  1. College of Information Engineering, China Jiliang University, Hangzhou, 310018, China

    Binggang Xiao, Hongya Lin, Mingyue Gu, Limin Hu, Fenglei Guo & Hongmei Mi

  2. Zhejiang University of Technology, Hangzhou, 310018, China

    Lihua Xiao

  3. Tourism College of Zhejiang, Hangzhou, 310018, China

    Dongxu Yang

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  1. Binggang Xiao
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  2. Hongya Lin
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  3. Lihua Xiao
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  4. Mingyue Gu
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  5. Dongxu Yang
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  6. Limin Hu
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  7. Fenglei Guo
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  8. Hongmei Mi
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Correspondence to Lihua Xiao.

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Xiao, B., Lin, H., Xiao, L. et al. A tunable dual-band THz absorber based on graphene sheet and ribbons. Opt Quant Electron 50, 370 (2018). https://doi.org/10.1007/s11082-018-1638-2

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  • DOI: https://doi.org/10.1007/s11082-018-1638-2

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