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A Nanoscale Fano Resonator by Graphene-Gold Dipolar Interference

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Abstract

A nanoscale Fano resonator composed of a hybrid graphene disk-gold ring combination is reported in this letter. The inner narrow dipolar resonance of a discrete state induced by graphene interferes with the outside broad dipolar resonance of a continuum state induced by gold, thus forming an asymmetric Fano transparency within the absorption window. The metastructure exhibits a wide tunable band along with an excellent refractive index sensing capability of 2344 nm/RIU. The geometry adjustment modulates the spectral response giving chances to the equivalent of electromagnetically induce transparency. Moreover, the group index exceeds 760 within the transparency window enabling a potential use in slow light or light storage applications. The analytic analysis is in accordance with the numerical simulation results.

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Authors and Affiliations

  1. Key Lab of All Optical Network, Advanced Telecommunication Network of EMC, School of Electronic Information and Engineering, Beijing Jiaotong University, Beijing, 100044, China

    Buzheng Wei & Shuisheng Jian

  2. Institute of Lightwave Technology, Beijing Jiaotong University, Beijing, 100044, China

    Buzheng Wei & Shuisheng Jian

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  1. Buzheng Wei
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  2. Shuisheng Jian
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Correspondence to Buzheng Wei.

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Wei, B., Jian, S. A Nanoscale Fano Resonator by Graphene-Gold Dipolar Interference. Plasmonics 13, 1889–1895 (2018). https://doi.org/10.1007/s11468-018-0703-9

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  • DOI: https://doi.org/10.1007/s11468-018-0703-9

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