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Saturday, March 12, 2016
Abstract-Giant nonlinearity in a superconducting sub-terahertz metamaterial
We report a superconducting sub-THz metamaterial operating in a CW-regime, which exhibits a record-breaking resonant third-order nonlinearity with effective n2∼10cm2/W. The nonlinear response is caused by the radiation-induced resistive heating, suppressing the superconductivity in the nano-scale constrictions of the structure's meta-molecules. The nonlinearity has a relaxation time of 25μs and leads to a substantial change of the amplitude and phase of the transmitted radiation at intensities of only 500μW/cm2.