Abstract
An overview of recent developments in the area of polar alignment of polymer films for second-order non-linear optical applications is presented in this paper. Recent experiments are described where relaxation of poling induced order in selected side and main polymers containing sulfonyl-substituted aminoazostilbene units as the nonlinear chromophore. Physical aging is shown to increase drastically the stability of polar induced alignment. A new mechanism involving end-to-end reorientation of the polar main chain polymer system is shown to lead to unprecedented orientational stability in non-cross-linked systems. Recent progress in the design of materials and fabrication of films by the Langmuir-Blodgett method is also discussed. Waveguide quality films with excellent thickness uniformity, waveguide losses on the order of 1 db cm -1, and with a χ (2) value of 10 -7 esu are discussed.
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