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Optical control of orientational bistability in photorefractive liquid crystals

Nature Materials volume 5, pages 185–188 (2006)Cite this article

Abstract

Materials with light-controlled properties are extremely attractive for information technologies and, among the wide range of approaches, that of photorefractive media is particularly relevant1,2. Photorefractivity is observed in photoconductors, where charge carriers photogenerated by non-uniform illumination redistribute over macroscopic distances, and where the resulting electric field modulates the refractive index. This effect has been used in a variety of devices for applications ranging from image treatment to beam steering and medical imaging. Compared with the more commonly studied inorganic crystals, photorefractive non-crystalline organic systems3,4,5,6 offer a more technologically appealing alternative, as these materials are mechanically flexible, can be easily modified chemically and are inexpensive. Here we show how a photogenerated space–charge field can be used to control the switching between the two stable orientational states of ferroelectric liquid crystals. The resulting refractive-index patterns are stable, easily erasable and rewritable. In contrast to more traditional organic photorefractive materials, where the refractive index is continuously modulated by the applied field, the liquid-crystalline device described here is a ‘binary’ system, in which the refractive index n switches between two values (Δn∼3×10−2 in this case, but Δn of the order of 10−1 is, in principle, possible).

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Figure 1: Structure of the SmC* phase and of the bistable photorefractive device.
Figure 2: Space–charge field-assisted writing of a grating in a bistable SmC* device.
Figure 3: Dependence of diffraction efficiency on experimental parameters.
Figure 4: Two-beam coupling in a bistable SmC* device.

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Acknowledgements

We thank L. Blinov for discussions. The liquid crystal L-15278 used in this study was a generous gift from M. Radcliffe. This work has been partially supported by MIUR under the projects Molecular and Organic/Inorganic Hybrid Nanostructure for Photonics—FIRB 2001 and PRIN 2004.

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  1. Department of Chemistry, Centro di Eccellenza CEMIF.CAL, Sezione INSTM della Calabria, University of Calabria, 87036, Rende, Italy

    Mara Talarico & Attilio Golemme

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  1. Mara Talarico
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Correspondence to Attilio Golemme.

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Talarico, M., Golemme, A. Optical control of orientational bistability in photorefractive liquid crystals. Nature Mater 5, 185–188 (2006). https://doi.org/10.1038/nmat1578

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