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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 1 — Jan. 14, 2013
  • pp: 1076–1086

Three-layered metallodielectric nanoshells: plausible meta-atoms for metamaterials with isotropic negative refractive index at visible wavelengths

DaJian Wu, ShuMin Jiang, Ying Cheng, and XiaoJun Liu  »View Author Affiliations

Optics Express, Vol. 21, Issue 1, pp. 1076-1086 (2013)

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A three-layered Ag−low-permittivity (LP)−high-permittivity (HP) nanoshell is proposed as a plausible meta-atom for building the three-dimensional isotropic negative refractive index metamaterials (NIMs). The overlap between the electric and magnetic responses of Ag−LP−HP nanoshell can be realized by designing the geometry of the particle, which can lead to the negative electric and magnetic polarizabilities. Then, the negative refractive index is found in the random arrangement of Ag−LP−HP nanoshells. Especially, the modulation of the middle LP layer can move the negative refractive index range into the visible region. Because the responses arise from the each meta-atom, the metamaterial is intrinsically isotropic and polarization independent. It is further found with the increase of the LP layer thickness that the negative refractive index range of the random arrangement shows a large blue-shift and becomes narrow. With the decrease of the filling fraction, the negative refractive index range shows a blue-shift and becomes narrow while the maximum of the negative refractive index decreases.

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OCIS Codes
(160.4760) Materials : Optical properties
(160.3918) Materials : Metamaterials
(350.4238) Other areas of optics : Nanophotonics and photonic crystals

ToC Category:

Original Manuscript: October 15, 2012
Revised Manuscript: December 8, 2012
Manuscript Accepted: December 29, 2012
Published: January 10, 2013

DaJian Wu, ShuMin Jiang, Ying Cheng, and XiaoJun Liu, "Three-layered metallodielectric nanoshells: plausible meta-atoms for metamaterials with isotropic negative refractive index at visible wavelengths," Opt. Express 21, 1076-1086 (2013)

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