Abstract
We have characterized the ultrafast dynamical properties of split ring resonators byutilizing optical pump–terahertz probe spectroscopy on a subpicosecond timescale. Theexperimental results show that the pump-induced relative changes in terahertz peaktransmission, as well as the dynamical transmission spectra, are different when theterahertz electric vector is perpendicular and parallel to the gap of the split ring resonator.It is found that the pump-induced photogenerated carriers play two opposite roles in SRRs,showing one is to absorb terahertz to reduce the transmission in the substrate and theother is to weaken the resonant absorption to enhance the transmission. Our numericalsimulations also prove that the pump pulse significantly influences the split ringresonator currents. We also show that the blue-shifts of the resonances are due tothe change of optical constants in the photoexcited semiconductor substrate.
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