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    • Active negative-index metamaterial powered by an electron beam 

      Alù, A; Shapiro, MA; Shvets, G; Temkin, RJ; Trendafilov, S; Urzhumov, Yaroslav A (Physical Review B - Condensed Matter and Materials Physics, 2012-08-21)
      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 ...