The morphology of the PPBN films deposited on Ca[F.
The third-order optical nonlinearity of a PPBN film was measured by subpicosecond time-resolved optical Kerr effect at the wavelength of 647 rim.
FT-IR, UV-vis, XPS and on-line MS studies revealed that a large [pi]-conjugated system has been formed in the PPBN thin films, and the polymerization of benzonitrile monomer took place mainly through the opening of carbon-nitrogen triple bonds by the free radical polymerization process.
In the case of higher discharge powers, some obvious folds were formed on the surface of PPBN films owing to the higher film deposition rate.
The extremely fast and larger nonlinear response of PPBN film was observed, which shows that PPBN film is a promising material for applications as fast optical switches and modulators.