Spectroscopic investigation of the electro-optic nonlinearity in poly(2,5-thienylene vinylene)

O. M. Gelsen, D. D.C. Bradley, H. Murata, N. Takada, T. Tsutsui, S. Saito

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    We report the results of a spectroscopic investigation of the quadratic electro-optic nonlinearity in poly(2,5-thienylene vinylene). Electroabsorption spectra closely resemble the second energy derivative of the unperturbed π-π* absorption and show oscillations associated with the strong vibronic features present therein. The dispersion of both the real and imaginary parts of χ(3) (-ω;0,0,ω) has been determined and we find that Re{χ(3)} has a peak value of 7.5×10-9 esu at 1.83 eV and Im{χ(3)} has a peak value of 6.2×10 -9 esu at 1.78 eV. This nonlinearity is responsible for a photorefractive effect under resonant photoexcitation.
    Original languageEnglish (US)
    JournalJournal of Applied Physics
    Issue number2
    StatePublished - Dec 1 1992

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