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Title: Efficient terahertz-wave generation and its ultrafast optical modulation in charge ordered organic ferroelectrics

Efficient terahertz (THz) wave generation in strongly correlated organic compounds α-(ET){sub 2}I{sub 3} and α′-(ET){sub 2}IBr{sub 2} (ET:bis(ethylenedithio)-tetrathiafulvalene) was demonstrated. The spontaneous polarization induced by charge ordering or electronic ferroelectricity was revealed to trigger the THz-wave generation via optical rectification; the estimated 2nd-order nonlinear optical susceptibility for α-(ET){sub 2}I{sub 3} is over 70 times larger than that for prototypical THz-source ZnTe. Ultrafast (<1 ps) and sensitive (∼40%) photoresponse of the THz wave was observed for α-(ET){sub 2}I{sub 3}, which is attributable to photoinduced quenching of the polarization accompanied by insulator(ferroelectric)-to-metal transition. Modulation of the THz wave was observed for α′-(ET){sub 2}IBr{sub 2} upon the poling procedure, indicating the alignment of polar domains.
Authors:
;  [1] ;  [2] ; ;  [1] ;  [3] ;  [4]
  1. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
  2. (Japan)
  3. Department of Applied Physics, Okayama University of Science, Okayama 700-0005 (Japan)
  4. Toyota Physical and Chemical Research Institute, Nagakute 480-1192 (Japan)
Publication Date:
OSTI Identifier:
22267754
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FERROELECTRIC MATERIALS; NONLINEAR PROBLEMS; POLARIZATION; TETRATHIAFULVALENE; ZINC TELLURIDES