Negative refraction and planar focusing based on parity-time symmetric metasurfaces.

@article{Fleury2014NegativeRA,
  title={Negative refraction and planar focusing based on parity-time symmetric metasurfaces.},
  author={Romain Fleury and Dimitrios L. Sounas and Andrea Al{\'u}},
  journal={Physical review letters},
  year={2014},
  volume={113 2},
  pages={023903}
}
We introduce a new mechanism to realize negative refraction and planar focusing using a pair of parity-time symmetric metasurfaces. In contrast to existing solutions that achieve these effects with negative-index metamaterials or phase conjugating surfaces, the proposed parity-time symmetric lens enables loss-free, all-angle negative refraction and planar focusing in free space, without relying on bulk metamaterials or nonlinear effects. This concept may represent a pivotal step towards loss… CONTINUE READING
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