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Ultrafast Terahertz Gating of the Polarization and Giant Nonlinear Optical Response in BiFeO3 Thin Films.

  • Author(s): Chen, Frank
  • Goodfellow, John
  • Liu, Shi
  • Grinberg, Ilya
  • Hoffmann, Matthias C
  • Damodaran, Anoop R
  • Zhu, Yi
  • Zalden, Peter
  • Zhang, Xiaohang
  • Takeuchi, Ichiro
  • Rappe, Andrew M
  • Martin, Lane W
  • Wen, Haidan
  • Lindenberg, Aaron M
  • et al.
Abstract

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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