Wavelength dependence of the third-order nonlinear optical properties of a polythiophene/selenophene derivative film

The third-order nonlinear optical properties of a hybrid polymer film containing substituted thiophene rings copolymerized with unsubstituted selenophene were measured using the Z-scan technique. Large, resonantly enhanced third-order nonlinearities were found at wavelengths on the low-energy side o...

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Bibliographic Details
Published in:Applied physics letters 1999-11, Vol.75 (21), p.3312-3314
Main Authors: Van Keuren, Edward, Wakebe, Takanori, Andreaus, Reinhard, Möhwald, Helmut, Schrof, Wolfgang, Belov, Vladimir, Matsuda, Hiro, Rangel-Rojo, Raul
Format: Article
Language:English
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Summary:The third-order nonlinear optical properties of a hybrid polymer film containing substituted thiophene rings copolymerized with unsubstituted selenophene were measured using the Z-scan technique. Large, resonantly enhanced third-order nonlinearities were found at wavelengths on the low-energy side of the absorption band. In contrast to the results on a similar copolymer film incorporating only thiophene, a strong two-photon absorption appeared in the near infrared. The imaginary part of the third-order susceptibility can be adequately explained as saturation of an exciton band, while the origin of the large negative real part is unknown.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.125335