Department of Electrical and Computer Engineering and Center for Metamaterials and Integrated Plasmonics, Duke University, Durham, North Carolina 27708, USA.
Phys Rev Lett. 2010 Sep 17;105(12):123905. doi: 10.1103/PhysRevLett.105.123905.
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 time-reversing discrete elements when parametrically pumped and illuminated with appropriate frequencies. The metamaterial elements were fabricated and shown experimentally to produce a time-reversed signal. Measurements confirm that a discrete array of phase-conjugating elements act as a negatively refracting time-reversal rf lens only 0.12λ thick.
我们展示了一种使用非线性超材料元件进行相位共轭的实验演示。理论上证明，加载变容二极管的有源分裂环谐振器在参数泵浦并以适当频率照明时，可以作为相位共轭或时间反转离散元件。超材料元件被制造出来并进行了实验，结果表明可以产生时间反转信号。测量结果证实，离散的相位共轭元件阵列作为负折射时间反转射频透镜，厚度仅为 0.12λ。
