Parity–time synthetic photonic lattices

@article{Regensburger2012ParitytimeSP,
  title={Parity–time synthetic photonic lattices},
  author={Alois Regensburger and Christoph Bersch and Mohammad-Ali Miri and Georgy Onishchukov and Demetrios N. Christodoulides and Ulf. Peschel},
  journal={Nature},
  year={2012},
  volume={488},
  pages={167-171}
}
The development of new artificial structures and materials is today one of the major research challenges in optics. In most studies so far, the design of such structures has been based on the judicious manipulation of their refractive index properties. Recently, the prospect of simultaneously using gain and loss was suggested as a new way of achieving optical behaviour that is at present unattainable with standard arrangements. What facilitated these quests is the recently developed notion of… 
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