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ABSTRACT
The photorefractive properties of chiral smectic C phases formed by cyclopalladated complexes were studied. The complexes were not doped with photosensitizers. A gain coefficient higher than 100 cm−1 at an applied field of 5.4 V/µm was measured. Measurements of phase shift between interference fringes and index grating were also performed. By using a previously developed model, the amplitude of the space-charge field was estimated and shown to be much smalled than what predicted by the commonly used model for photorefractive inorganic crystals.
Acknowledgments
This work has been partially supported by MIUR under the “Molecular and Organic/Inorganic Hybrid Nanostructures for Photonics – FIRB 2001” project. P.P. thanks the Marie Curie development host fellowship contract HPMD-CT-2001–00073 for financial support.