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Plasmonics

, Volume 11, Issue 5, pp 1207–1212 | Cite as

Magnetic-Based Fano Resonance by a Trimer with Y-shaped Gap

  • Li Liu
  • Yiping HuoEmail author
  • Yuan Li
  • Kaijun Zhao
Article

Abstract

We introduce a Y-shaped gap into a silver disk to break the structure symmetry which can be looked as a loop-linked structure. Magnetic resonances are excited by incident light when incident electric field is parallel to the trimer plane. Fano resonance is generated by the coupling between bright electric mode and dark magnetic mode. These resonances can be adjusted by tuning the gap size, the radius of trimer, and the position of Y-shaped gap. The extinction cross section of the structure is calculated with the finite element method (FEM). The maximum figure of merit (FOM) is 37.8. Both the magnetic and electric field are greatly enhanced at the Fano dip and the magnetic resonance peak.

Keywords

Fano resonance (FR) Magnetic resonance Figure of merit (FOM) Finite element method (FEM) 

Notes

Acknowledgments

The work was supported by the Fundamental Research Funds for the Central Universities (GK201002038) and Natural Science Basis Research Plan in Shaanxi Province of China (2011JQ1014).

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.School of Physics and Information TechnologyShaanxi Normal UniversityXi’anChina

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