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为提高金属酞菁膜的三阶非线性光学性质,采用静电自组装技术制备出了包含阴离子四磺化酞菁氧钒(VOTsPc)和阳离子聚乙烯亚胺(PEI)交替层的复合薄膜.通过紫外-可见光谱仪表征了VOTsPc/PEI交替多层组装体的组装过程,结果表明组装过程为有规律的连续吸收过程.利用原子力显微镜技术研究了VOTsPc/PEI薄膜的表面形貌,结果表明膜表面是光滑的、均匀的;膜表面紧密堆积了纳米级颗粒,平均粒径为75 nm,平均表面粗糙度为4.406 nm.使用调Q倍频ns/ps Nd∶YAG脉冲激光系统,在输出激光波长为532 nm,脉冲宽度为4 ns条件下,通过Z-扫描测试研究了组装膜的三阶非线性光学性质.通过对实验数据的模拟和计算,30-双层VOTsPc/PEI膜的非线性极化率n2和非线性吸收系数β值分别为4.87×10-6esu和1.2×10-5m/W,三阶非线性极化率χ(3)值为1.57×10-6esu.VOTsPc/PEI膜显示出较强的非线性反饱和吸收性能,具有广阔的应用前景.
In order to improve the third-order nonlinear optical properties of metal phthalocyanine films, a composite film containing alternating layers of anionic tetrasulfonated vanadyl phthalocyanine (VOTsPc) and cationic polyethyleneimine (PEI) was prepared by electrostatic self-assembly technique. The assembly process of VOTsPc / PEI alternating multilayered assemblies was characterized by UV-Vis spectroscopy and the results showed that the assembly process was a regular continuous absorption process.The surface morphology of VOTsPc / PEI films was studied by atomic force microscopy and the results showed that the membrane surface was Smooth and uniform; the surface of the film is closely packed with nano-particles with an average particle diameter of 75 nm and an average surface roughness of 4.406 nm. Using a Q-doubled ns / ps Nd:YAG pulsed laser system, when the output laser wavelength is 532 nm and a pulse width of 4 ns, the third-order nonlinear optical properties of the assembled films were investigated by Z-scan. The nonlinear polarization of the 30-bilayer VOTsPc / PEI films was simulated and calculated by the experimental data Rate n2 and non-linear absorption coefficient β were 4.87 × 10-6esu and 1.2 × 10-5m / W respectively, and the third-order nonlinear polarizability χ (3) was 1.57 × 10-6esu.VOTsPc / PEI films showed Strong non-linear anti-saturation absorption, with a wide Application prospects.