采用常压直流电沉积技术在有序多孔氧化铝(OPAA)模板内沉积Cu纳米晶, 制备出光学透明的铜纳米晶/ OPAA复合膜. 利用FESEM、TEM、紫外可见分光光度计、Z-scan技术、泵浦探测技术对该复合材料的形貌、结构、线性光吸收、三阶非线性极化率和光响应时间进行了分析. 结果表明, Cu纳米颗粒具有面心立方结构, 直径在40~50 nm之间, 分布在OPAA模板的分叉孔道区. 填充于有序多孔氧化铝模板中的Cu纳米晶在584 nm处出现等离子体共振吸收峰. 当探测光波长远离铜纳米晶的等离子体共振吸收峰时, Cu纳米晶/多孔氧化铝复合膜出现光致吸收特性, 而当探测光波长接近铜纳米晶的等离子体共振吸收峰时, 出现光致漂白现象. 该复合膜非共振三阶非线性极化率为0.73×10-9esu, 光响应时间为1.3ps.
Optically transparent Cu nanocrystalline/OPAA composite film was successfully prepared by electrodepositing Cu into ordered porous anodic alumina (OPAA) template using constant voltage direct current technique. The morphology, structure, linear optical absorption, third-order optical nonlinearity and ultrafast dynamics of the Cu/OPAA composite were characterized by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM). UV-Vis spectrophotometer, Z-scan technique and femtosecond pump-probe experiment. The results show that Cu nanoparicles have diameters of 40–50nm with face center cubic structure and disperse in the branched pores of the OPAA template, which induce a surface plasmon resonance (SPR) absorption at 584 nm. When the probe optical wavelength is far away from the SPR wavelength, Cu nanocrystalline/OPAA composite film possesses a character of light-induced absorption. When the probe optical wavelength is near the SPR wavelength, it possesses a photo-bleaching character. The composite film has a non-resonant third-order nonlinear susceptibility of 0.73×10-9 esu and a response time of 1.3 ps.
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