Abstract
Large, ultrafast second and third order nonlinear optical properties have been demonstrated in a large number of organic and polymer structures. Such advances are important to the fields of nonlinear optics and optical device technologies. The organic and polymer systems can be formed as organizable designed structures possessing a number of special primary properties that include wideband electronic polarizations whose microscopic origin resides in highly charge correlated virtual excitations. These ultrafast excitations occur on individual molecular, or polymer chain, sites whose condensed assemblies are described by their orientational distribution functions. In this regard, the results of two recent studies are reviewed.
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CNDO/s parameters optimized for optical excitations with standard bond lengths and angles for all trans geometry. Calculated components of μ: μx=9.4, μy=−0.5 and μz≃0 D with μ at an angle of 3°≃0° to x-axis, in which case μ=μxcosθ+μysinθ≃μx and βx=βxxxx+1/3(βxyy+βxxz+2βyyz+2βzzx).
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Garito, A., Wong, K. Nonlinear Optical Processes in Organic and Polymer Structures. Polym J 19, 51–60 (1987). https://doi.org/10.1295/polymj.19.51
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DOI: https://doi.org/10.1295/polymj.19.51