Bi-layer cross chiral structure with strong optical activity and negative refractive index.

@article{Dong2009BilayerCC,
  title={Bi-layer cross chiral structure with strong optical activity and negative refractive index.},
  author={Jianfeng Dong and Jiangfeng Zhou and Thomas Koschny and Costas M. Soukoulis},
  journal={Optics express},
  year={2009},
  volume={17 16},
  pages={14172-9}
}
The properties of periodic pairs of mutually twisted metallic (silver) crosses separated by dielectric layer have been investigated by numerical simulation. The results show that the exceptionally strong polarization rotation and circular dichroism, negative permeability and negative refractive index are found at the infrared communication wavelength (1.55 microm). 
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