Structural characterizations and the third-order nonlinear optical properties of poly(2,5-didecyloxy)phenylene films modified by N+ ions implantation

摘要

Poly(2,5-didecyloxy)phenylene (PDDOP) films implanted by 30 keV nitrogen ions (NT) with the dose rang of 10~(15)-10~(17) ions/cm~2 were characterized by FTIR-ATR spectra, UV-VIS spectra and X-ray photoelectron spectroscopy, which showed that the C-H bonds of the PDDOP films were largely broken and new bonds like C=C, C=N and C=N were formed as the increasing ion fluence. The third-order nonlinear optical susceptibilities (x~(3)) were measured by degenerate four-wave mixing (DFWM) technique at 532 nm. The results demonstrated that the (x~(3)) value of PDDOP films was maximized to 4.19 x 10" esu at an ion dose of 1.15 x 1017 ions/cm2, which was 4.4 times larger than that of the pristine film. The enhanced third-order nonlinear properties may attribute to the enlarged expansion coefficient and the enhanced absorption coefficient of the bombarded films at proper N~+ ions dose.