Optical activity in extrinsically chiral metamaterial

@article{Plum2008OpticalAI,
  title={Optical activity in extrinsically chiral metamaterial},
  author={E. Plum and V. Fedotov and N. Zheludev},
  journal={Applied Physics Letters},
  year={2008},
  volume={93},
  pages={191911}
}
We demonstrate optical activity in an intrinsically non-chiral anisotropic planar metamaterial. The phenomenon is due to extrinsic chirality resulting from the mutual orientation of the metamaterial structure and the incident electromagnetic wave. The polarization effect, which has a resonant nature, features a spectral band where linear birefringence is practically absent and can be easily tuned by tilting the plane of the metamaterial relative to the incident beam. 

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