Abstract

High-performance photorefractive materials based on the layered photoconductive polymers PPT-CZ [rigid backbone of poly(p-phenyleneterephthalate) with pendent carbazole groups] are studied. The composites are composed of PPT-CZ and are doped with the sensitizer ${\mathrm{C}}_{60}$ and nonlinear optical chromophores. Despite the absence of a plasticizer and the lower concentration of the carbazole photoconductive moieties as compared with poly(N-vinyl carbazole), these materials show high photorefractive sensitivity, i.e., $S_{n2}$ of $70\pm \hspace{0.5em}7 {\mathrm{cm}}^2/\mathrm{kJ}$ at $E_0=100 \mathrm{V}/\mu \mathrm{m}$ for $\mathrm{PPT}-\mathrm{CZ}(n=12):\mathrm{diethylaminodicyanostyrene}:{\mathrm{C}}_{60}.$ The low glass transition temperature (<0°C) leads to a high rotational mobility of the chromophores that results in large refractive-index changes. For all the composites that were investigated, the two-wave mixing gain Γ exceeds 100 cm^-1 at an applied field of 50 V/μm.

© 2003 Optical Society of America

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