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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 7 — Apr. 8, 2013
  • pp: 8426–8436

Multiple Fano resonances in single-layer nonconcentric core-shell nanostructures

Jingjing Zhang and Anatoly Zayats  »View Author Affiliations

Optics Express, Vol. 21, Issue 7, pp. 8426-8436 (2013)

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Multiple plasmonic Fano resonances are generally considered to require complex nanostructures, such as multilayer structure, to provide several dark modes that can couple with the bright mode. In this paper, we show the existence of multiple Fano resonances in single layer core-shell nanostructures where the multiple dark modes appear due to the geometrical symmetry breaking induced by axial offset of the core. Both dielectric-core-metal-shell (DCMS) and metal-core-dielectric-shell (MCDS) configurations have been studied. Compared to the MCDS structure, the DCMS configuration provides higher modulation depth. Analytical studies based on transformation optics and numerical simulations have been performed to investigate the role of geometrical and material parameters on the optical properties of the proposed nanostructures. Refractive index sensing with higher-order Fano resonances has also been described, providing opportunity for multiwavelength sensing with high figure of merit.

© 2013 OSA

OCIS Codes
(160.4760) Materials : Optical properties
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance

ToC Category:
Optics at Surfaces

Original Manuscript: January 14, 2013
Revised Manuscript: March 4, 2013
Manuscript Accepted: March 4, 2013
Published: March 29, 2013

Jingjing Zhang and Anatoly Zayats, "Multiple Fano resonances in single-layer nonconcentric core-shell nanostructures," Opt. Express 21, 8426-8436 (2013)

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