Nathaniel K Grady1, Bradford G Perkins Jr2,3, Harold Y Hwang2, Nathaniel C Brandt2, Darius Torchinsky2, Ranjan Singh1, Li Yan1, Daniel Trugman1, Stuart A Trugman1, Q X Jia1, Antoinette J Taylor1, Keith A Nelson2 and Hou-Tong Chen1,4
We report the observation of a nonlinear terahertz response of split-ring resonator arrays made of high-temperature superconducting films. Intensity-dependent transmission measurements indicate that the resonance strength decreases dramatically (i.e. transient bleaching) and the resonance frequency shifts as the intensity is increased. Pump–probe measurements confirm this behaviour and reveal dynamics on the few-picosecond timescale.
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