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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 6 — Mar. 12, 2012
  • pp: 6146–6156

Composite chiral metamaterials with negative refractive index and high values of the figure of merit

Zhaofeng Li, Kamil Boratay Alici, Humeyra Caglayan, Maria Kafesaki, Costas M. Soukoulis, and Ekmel Ozbay  »View Author Affiliations


Optics Express, Vol. 20, Issue 6, pp. 6146-6156 (2012)
http://dx.doi.org/10.1364/OE.20.006146


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Abstract

A composite chiral metamaterial (CCMM) is designed and studied both numerically and experimentally. The CCMM is constructed by the combination of a continuous metallic wires structure and a purely chiral metamaterial (CMM) that consists of conjugated Rosettes. For the CMM, only very small, useful bands of negative index can be obtained for circularly polarized waves. These bands are all above the chiral resonance frequencies because of the high value of the effective parameter of relative permittivity ε. After the addition of the continuous metallic wires, which provide negative permittivity, the high value of ε can be partially compensated. Thus, a negative index band for the left circularly polarized wave that is below the chiral resonance frequency is obtained for the CCMM. At the same time, a negative index band for the right circularly polarized wave that is above the chiral resonance frequency is also obtained. Furthermore, both negative index bands correspond to the transmission peaks and have high values of the figure of merit. Therefore, the CCMM design that is proposed here is more suitable than the CMM for the construction of chiral metamaterials with a negative index.

© 2012 OSA

OCIS Codes
(230.5440) Optical devices : Polarization-selective devices
(160.1585) Materials : Chiral media
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Metamaterials

History
Original Manuscript: January 18, 2012
Manuscript Accepted: February 14, 2012
Published: February 29, 2012

Citation
Zhaofeng Li, Kamil Boratay Alici, Humeyra Caglayan, Maria Kafesaki, Costas M. Soukoulis, and Ekmel Ozbay, "Composite chiral metamaterials with negative refractive index and high values of the figure of merit," Opt. Express 20, 6146-6156 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-6-6146


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