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Cubic Nonlinear Optical Properties of Thin Films of a Series of Aromatic Schiff Base Polymers

  • Chen-Jen Yang (a1), Samson A. Jenekhe (a1), Herman Vanherzeele (a2) and Jeffrey S. Meth (a2)

Abstract

The third-order nonlinear optical properties of a series of homopolymers and a random copolymer of conjugated aromatic Schiff base polymers have been investigated by picosecond third harmonic generation spectroscopy in the wavelength range 0.9–2.4 um. The off-resonant χ(3)(-3ω;ω, ω, ω) value at 2.4 μm was found to be 1.6×10−12esu for the parent polymer (PPI). 2, 5-Dimethoxy and 2, 5-dihydroxy substitutions or random colpolymerization was found to enhance the nonresonant optical nonlinearity of PPI by a factor of 1.5–4.5. 2-Methyl substitution lowered the χ(3) value. The three-photon resonance enhanced χ(3) of the polymers was in the range l.l×10−11 to 5.2×l0−11 esu. A three-level essential states model was found to describe the observed χ(3) spectra and the resulting fitting parameters were used to explain the observed trends in structure - χ(3) relationships.

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Cubic Nonlinear Optical Properties of Thin Films of a Series of Aromatic Schiff Base Polymers

  • Chen-Jen Yang (a1), Samson A. Jenekhe (a1), Herman Vanherzeele (a2) and Jeffrey S. Meth (a2)

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