"Ultra-fast 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 and Aaron M. Lindenberg; Advanced Materials, 09/21/15.

Additional Authors: 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 and Aaron M. Lindenberg

Abstract:

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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.