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Plasmonics

, Volume 13, Issue 6, pp 1889–1895 | Cite as

A Nanoscale Fano Resonator by Graphene-Gold Dipolar Interference

  • Buzheng Wei
  • Shuisheng Jian
Article

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.

Keywords

Fano resonance Electromagnetically induced transparency Surface plasmon polaritons 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Lab of All Optical Network, Advanced Telecommunication Network of EMC, School of Electronic Information and EngineeringBeijing Jiaotong UniversityBeijingChina
  2. 2.Institute of Lightwave TechnologyBeijing Jiaotong UniversityBeijingChina

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