Abstract
Poly(3-decayl)thiophene (P3DT) films implanted by 30 keV nitrogen ions (N +) with the dose range of 10 15–10 17 ions/cm 2 were characterized by FTIR-ATR spectra, which showed that the C–H bonds of the P3DT films were largely broken and new bonds like C C, C N and C N were formed as the increasing ion fluences. The third-order nonlinear optical susceptibilities ( χ (3)) were measured by degenerate four-wave mixing (DFWM) technique at 532 nm. The results demonstrated that the ( χ (3)) value of P3DT films was maximized to 2.61 × 10 −9 esu at an ion dose of 5.73 × 10 16 ions/cm 2, which was almost four times larger than that of the pristine film. The enhanced third-order nonlinear properties may attribute to the enlarged expansion coefficient of the bombarded films at proper N + ions dose.
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