Light Stops at Exceptional Points.

  title={Light Stops at Exceptional Points.},
  author={Tamar Goldzak and Alexei A. Mailybaev and Nimrod Moiseyev},
  journal={Physical review letters},
  volume={120 1},
Almost twenty years ago, light was slowed down to less than 10^{-7} of its vacuum speed in a cloud of ultracold atoms of sodium. Upon a sudden turn-off of the coupling laser, a slow light pulse can be imprinted on cold atoms such that it can be read out and converted into a photon again. In this process, the light is stopped by absorbing it and storing its shape within the atomic ensemble. Alternatively, the light can be stopped at the band edge in photonic-crystal waveguides, where the group… 

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