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    • Phase conjugation and negative refraction using nonlinear active metamaterials. 

      Katko, Alexander R; Gu, Shi; Barrett, John P; Popa, Bogdan-Ioan; Shvets, Gennady; Cummer, Steven A (Phys Rev Lett, 2010-09-17)
      We present an experimental demonstration of phase conjugation using nonlinear metamaterial elements. Active split-ring resonators loaded with varactor diodes are demonstrated theoretically to act as phase-conjugating or ...