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Ultrafast Terahertz Gating of the Polarization and Giant Nonlinear Optical Response in BiFeO 3 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.
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201502975
Subject(s) - materials science , ultrashort pulse , terahertz radiation , optoelectronics , nonlinear optical , gating , polarization (electrochemistry) , thin film , nonlinear optics , nonlinear system , optics , nanotechnology , laser , chemistry , physics , quantum mechanics , physiology , biology
Terahertz pulses are applied as an all‐optical bias to ferroelectric thin‐film BiFeO 3 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.