Ultrafast Terahertz Gating of the Polarization and Giant Nonlinear Optical Response in BiFeO3 Thin Films
Frank Chen , John Goodfellow , Shi Liu , Ilya Grinberg , Matthias C. Hoffmann ,Anoop R. Damodaran , Yi Zhu , Peter Zalden , Xiaohang Zhang , Ichiro Takeuchi , Andrew M. Rappe , Lane W. Martin , Haidan Wen , Aaron M. Lindenberg
Terahertz pulses are applied as an all-optical bias to ferroelectric thin-film BiFeO3 while monitoring the time-dependent ferroelectric polarization through its nonlinear optical response. Modulations in the intensity of the second harmonic light generated by the film correspond to on–off ratios of 220× gateable on femtosecond timescales. Polarization modulations comparable to the built-in static polarization are observed.
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