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Title: Ultrafast terahertz gating of the polarization and giant nonlinear optical response in BiFeO3 thin films

In this article, 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.
 [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [6] ;  [2] ;  [7] ;  [5] ;  [1]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  2. Univ. of Pennsylvania, Philadelphia, PA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of California, Berkeley, CA (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
  6. Univ. of Maryland, College Park, MD (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0935-9648
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Advanced Materials
Additional Journal Information:
Journal Volume: 27; Journal Issue: 41; Journal ID: ISSN 0935-9648
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE MATSCI; OPTICS; ferroelectrics; ultrafast; terahertz modulators; nonlinear optical properties