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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 20 — Oct. 7, 2013
  • pp: 23619–23630

Tunablity of the unconventional Fano resonances in coated nanowires with radial anisotropy

H. L. Chen and L. Gao  »View Author Affiliations


Optics Express, Vol. 21, Issue 20, pp. 23619-23630 (2013)
http://dx.doi.org/10.1364/OE.21.023619


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Abstract

We establish full-wave electromagnetic scattering theory to study the near-field and far-field spectra of radially anisotropic coated nanowires. For coated nanowires containing radially anisotropic core and plasmonic shell, unconventional Fano resonances are predicted due to the interference between dipole cloaking mode and dipole resonant mode. In contrast to Z-shaped Fano profile with small modulation depth for coated nanospheres in Argyropoulos et al, Phys. Rev. Lett. 108, 263905 (2012), we predict S-shaped Fano profile with high depth for coated nanowires. An off-resonance field enhancement in the radially anisotropic core is found at the Fano dip, and its’ magnitude is approximately the same as that the one at the low-energy resonant wavelength. Furthermore, with our adjustment of the inner size and the permittivity elements of the anisotropic core, tunable Fano-like profiles can be realized. These results may be useful for potential applications in different fields of nanotechnology.

© 2013 OSA

OCIS Codes
(160.4760) Materials : Optical properties
(260.0260) Physical optics : Physical optics
(260.2110) Physical optics : Electromagnetic optics
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Physical Optics

History
Original Manuscript: August 14, 2013
Revised Manuscript: September 13, 2013
Manuscript Accepted: September 16, 2013
Published: September 26, 2013

Citation
H. L. Chen and L. Gao, "Tunablity of the unconventional Fano resonances in coated nanowires with radial anisotropy," Opt. Express 21, 23619-23630 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-20-23619


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