Powell, David A.Shadrivov, Ilya V.Kivshar, Yuri2015-12-162015-12-160003-6951http://hdl.handle.net/1885/95056We propose and design a new type of nonlinear metamaterials exhibiting a resonant electric response at microwave frequencies. By introducing a varactor diode as a nonlinear element within each resonator, we are able to shift the frequency of the electric mode stop-band by changing the incident power, without affecting the magnetic response. These elements could be combined with the previously developed nonlinear magnetic metamaterials in order to create negative index media with control over both electric and magnetic nonlinearities.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 2009 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/10.1063/1.3212726Keywords: Electric response; Incident power; Magnetic metamaterials; Magnetic non-linearity; Magnetic response; Negative index media; Nonlinear elements; Stop-bands; Varactor diodes; Control nonlinearities; Metamaterials; Varactors; Frequency response2009-08-2410.1063/1.32127262016-02-24