New materials for non-linear optics

摘要

A variety of novel materials has been synthesized including poly[ethynediyl-arylene-ethynediyl-silylene]s (PEAES) containing hypercoordinate silicon, and films of metal-containing polyacrylonitrile materials. The χ~((3)) properties in various matrices have been investigated by various techniques such as DFWM and Z-scan. The χ~((3)) values are outstandingly high; e.g. sol-gel films incorporating 5-14 mass% PEAES show |Reχ~((3))| = 3-9 x 10~(-11) esu, and films of Cr-containing polyacrylonitrile materials synthesized by the polycyanoethylation reaction between acrylonitrile and Ar_2Cr show χ~((3)) = -2.5 x 10~(-10) esu.