29 November 2000 Electrostatically self-assembled electro-optic thin films
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Abstract
Thin film electro-optic materials have been synthesized by a novel electrostatic self-assembly (ESA) method. This wet chemistry synthesis method allows the molecular-level, layer-by-layer formation of multilayer thin and thick films of alternating anionic and cationic molecules and other materials. We have found that during the adsorption of dipolar molecules from solution to form a single molecular layer, the dipoles align themselves. In a multilayered material, this leads to multiple functionalities that require a noncentrosymmetric molecular structure such as active optical properties and piezoelectric behavior. Such properties are usually achieved in other materials by electric field poling. In this paper, we describe the precursor molecular chemistries that we have developed to make electro-optic thin films by this method, how the films are formed, the resulting molecular orientation within the film, and measured by electro-optic coefficients to date. We also describe how the ESA process precursor chemistry may be modified to allow the incorporation of noble metal nanoclusters to form flexible thin films with electrical conductivity on the order of that bulk metals. Such conducting films have been used to form electrode layers on prototype electro-optic devices.
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Kristi L. Cooper, Kristi L. Cooper, Yanjing Liu, Yanjing Liu, Richard O. Claus, Richard O. Claus, Liangmin Zhang, Liangmin Zhang, "Electrostatically self-assembled electro-optic thin films", Proc. SPIE 4114, Photonic Devices and Algorithms for Computing II, (29 November 2000); doi: 10.1117/12.408542; https://doi.org/10.1117/12.408542
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