A Nanoscale Fano Resonator by Graphene-Gold Dipolar Interference |
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| Authors: | Buzheng Wei Shuisheng Jian |
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| Institution: | 1.Key Lab of All Optical Network, Advanced Telecommunication Network of EMC, School of Electronic Information and Engineering,Beijing Jiaotong University,Beijing,China;2.Institute of Lightwave Technology,Beijing Jiaotong University,Beijing,China |
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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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