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Nonlinear Optical Properties of Two Thiophene-Based Polyconjugated Systems: Photoinduced Absorption and Third Harmonic Generation Spectroscopy

Published online by Cambridge University Press:  25 February 2011

R. Zamboni ,
C. Taliani ,
G. Ruani ,
A. J. Pal  and
F. Kajzar
R. Zamboni
Affiliation:
Istituto di Spettroscopia Molecolare, CNR, Via de’ Castagnoli, 1,40126 Bologna, Italy
C. Taliani
Affiliation:
Istituto di Spettroscopia Molecolare, CNR, Via de’ Castagnoli, 1,40126 Bologna, Italy
G. Ruani
Affiliation:
Istituto di Spettroscopia Molecolare, CNR, Via de’ Castagnoli, 1,40126 Bologna, Italy
A. J. Pal
Affiliation:
Istituto di Spettroscopia Molecolare, CNR, Via de’ Castagnoli, 1,40126 Bologna, Italy
F. Kajzar
Affiliation:
CEA-IRDI, DEIN-LPEM, CEN/Saclay, 91191 Gif-sur-Yvette Cedex, France
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Abstract

Nonlinear optical properties of two thiophene-based conjugated polymers (PTT and PDTB) were studied by the photoinduced absorption spectroscopy and the third harmonic generation spectroscopy. The results obtained with these two methods are used to estimate the value of χ(3) in these materials. Resonant χ(3) are (2.0 ± 0.2) × 10−11 e.s.u. and (1.0 ± 0.1) × 10−11 e.s.u. for PTT and PDTB, respectively. χ(3) is shown to be related to the width of the optical gap through a sixth-power law. In PTT a vibronic structure due to the C = C stretching mode appears in the χ(3) spectrum.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 613
Copyright
Copyright © Materials Research Society 1990

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References

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