Organic photonic materials

Various types of organic polymeric systems having third order nonlinear sus ceptibility, were presented at the Symposium. In this report however, only st nanocomposite system consisting of a polydiacetytrene dispersed in an am orphous host polymer, is described. N,N'-di-n-butylocta3,5-diynylenediureth ane was mixed with a copolymer of vinylacetate and vinylpyrrolidone in chlo roform and the solution was evaporated to form a highly transparent him, wh ich developed red coloring on irradiation of UV light. The maximum concentr ation of the diacetylene in the host polymer was about 20% by weight, and o ver this concentration the films contained large crystal particles which ma de them opaque. The third order nonlinear susceptibility measured by Z-scan method with 800 nm found to be in the range of 10(-11) esu.