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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 2 — Jan. 28, 2013
  • pp: 2236–2244

Double Fano resonances due to interplay of electric and magnetic plasmon modes in planar plasmonic structure with high sensing sensitivity

Junqiao Wang, Chunzhen Fan, Jinna He, Pei Ding, Erjun Liang, and Qianzhong Xue  »View Author Affiliations

Optics Express, Vol. 21, Issue 2, pp. 2236-2244 (2013)

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Double Fano resonant characteristics are investigated in planar plasmonic structure by embedding a metallic nanorod in symmetric U-shaped split ring resonators, which are caused by a strong interplay between a broad bright mode and narrow dark modes. The bright mode is resulted from the nanorod electric dipole resonance while the dark modes originate from the magnetic dipole induced by LC resonances. The overlapped dual Fano resonances can be decomposed to two separate ones by adjusting the coupling length between the nanorod and U-shaped split ring resonators. Fano resonances in the designed structure exhibit high refractive-index sensing sensitivity and figure of merit, which have potential applications in single or double-wavelength sensing in the near-infrared region.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Optics at Surfaces

Original Manuscript: November 8, 2012
Revised Manuscript: December 24, 2012
Manuscript Accepted: January 11, 2013
Published: January 23, 2013

Junqiao Wang, Chunzhen Fan, Jinna He, Pei Ding, Erjun Liang, and Qianzhong Xue, "Double Fano resonances due to interplay of electric and magnetic plasmon modes in planar plasmonic structure with high sensing sensitivity," Opt. Express 21, 2236-2244 (2013)

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