Active negative-index metamaterial powered by an electron beam

@article{Shapiro2012ActiveNM,
  title={Active negative-index metamaterial powered by an electron beam},
  author={Michael A. Shapiro and Simeon Trendafilov and Yaroslav A. Urzhumov and Andrea Al{\'u} and Richard J. Temkin and Gennady Shvets},
  journal={Physical Review B},
  year={2012},
  volume={86},
  pages={085132}
}
An active negative index metamaterial that derives its gain from an electron beam is introduced. The metamaterial consists of a stack of equidistant parallel metal plates perforated by a periodic array of holes shaped as complementary split-ring resonators. It is shown that this structure supports a negative-index transverse magnetic electromagnetic mode that can resonantly interact with a relativistic electron beam. Such a metamaterial can be used as a coherent radiation source or a particle… 

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