Several acrylic polymers bearing pendant stilbene or azobenzene chromophores containing 4'-dhkylamino eledron donors and 4-methylsulfonyl electron acceptors have been synthesized. These amorphous polymers exhibited good film-forming abilities, moderately high glass transition temperatures, and excellent optical clarity. Film samples of the polymers were poled in electric fields and demonstrated large, stable second-order nonlinear optical properties. Electrooptic coefficients at 632 nm were measured using ellipsometry. To demonstrate their utility in electrooptical devices, the title polymers were fabricated into low-low waveguides, and Mach-Zehnder interferometers were constructed. Electrooptic coefficients as high as 12 pm/V were measured at 860 nm with these prototypical devices. Comparisons between experimental and predicted electrooptic coefficients are presented.
The singlet–triplet absorption spectrum of crystalline 1,1′-diethyl-2,2′-cyanine iodide has been obtained. The absorption origin consists of two lines separated by ∼4.0 cm−1. Zeeman spectra were used to assign the higher energy more intense line to the Au factor group state and the lower energy line to the Bu factor group state. Emission spectra have been obtained from both dilute and concentrated solid solutions of the dye. The results from the concentrated samples indicate that the largest excitation–transfer interaction between translationally inequivalent molecules is less than 1 cm−1.
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