Powell, David A.Shadrivov, Ilya V.Kivshar, Yuri2015-12-162015-12-160003-6951http://hdl.handle.net/1885/95052We study parametric amplification in nonlinear left-handed transmission lines, which serve as model systems for nonlinear negative index metamaterials. We experimentally demonstrate amplification of a weak pump signal in three regimes: with the signal in the left-handed band, with the signal in the stop band, and with the signal at a defect frequency. In particular, we demonstrate the amplification of the incident wave by up to 15dB in the left-handed regime.The authors acknowledge the financial support of the Australian Research Council.http://www.sherpa.ac.uk/romeo/issn/0003-6951..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 16/12/15). Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at https://doi.org/10.1063/1.3089842Keywords: Electric lines; Metamaterials; Power transmission; Transmission line theory; Defect frequencies; Incident waves; Left-handed transmission lines; Model systems; Negative indices; Parametric amplifications; Stop bands; Weak signals; Amplification2009-02-2710.1063/1.30898422016-02-24