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Orientation of the Disperse Red 1 Chromophore Along the Polar Axis in Ferroelectric Liquid Crystals

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Abstract

Organic thin films with large second order nonlinear susceptibility χ(2) are of potential utility in fast integrated electro-optic modulators. Ferroelectric liquid crystals (FLCs), possessing a thermodynamically stable polar structure, and therefore non-zero χ(2) with infinite "thermal stability," combined with good processibility on semiconductor substrates, seem to provide an excellent approach to creation of χ(2) thin films. Indeed, we have outlined in detail an approach for achieving useful χ(2) values in FLCs by orientation of the p-nitroaniline unit along the FLC polar axis. [1] This approach was later shown to afford an FLC glass with χ(2) values on the order of 5 pm/V. [2] However, to be most useful for fabrication of integrated electro-optic modulators, χ(2) values on the order of 50 pm/V arc required.

© 1995 Optical Society of America

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