Zhao Hongyan, Song Feng, Wang Fengxiao, Liu Jiadong, Liu Yanling, Zhang Jun, Chen Guiyang, Liu Shujing
J Nanosci Nanotechnol. 2014 Jun;14(6):4357-62. doi: 10.1166/jnn.2014.8262.
The influence of 12 nm spherical silver nanoparticles (AgNPs) and 20 nm spherical gold nanoparticles (AuNPs) on the luminescence of europium complex Eu(TTFA)3 were studied. When 350 nm is chosen as the incident light, the maximum enhancement factor of the complexes mixed with AgNPs is about 2.5 at the wavelength of 612 nm. Besides the enhancement of the localized field, the overlap between the localized surface plasmon resonance spectra of nanoparticles and the absorption band of fluorescent molecules is another important factor for excitation field enhancement. By means of the quasi-static approximation theory, the distribution of the electric field around a single spherical metallic nanopaticle illuminated by plane wave was calculated. The simulation results show that the field enhancement effect is more obvious when the incident light is close to the resonance of the metallic nanoparticle, which could be demonstrated by our following experimental results. The distribution of the electric field under the same conditions was also simulated through the COMSOL software. The results are consistent with those of the quasi-static approximation theory.
研究了12纳米球形银纳米颗粒（AgNPs）和20纳米球形金纳米颗粒（AuNPs）对铕配合物Eu(TTFA)3发光的影响。当选择350纳米作为入射光时，在612纳米波长处，与AgNPs混合的配合物的最大增强因子约为2.5。除了局域场增强外，纳米颗粒的局域表面等离子体共振光谱与荧光分子吸收带之间的重叠是激发场增强的另一个重要因素。借助准静态近似理论，计算了平面波照射下单球形金属纳米颗粒周围的电场分布。模拟结果表明，当入射光接近金属纳米颗粒的共振时，场增强效应更明显，这可以通过我们接下来的实验结果得到证明。还通过COMSOL软件模拟了相同条件下的电场分布。结果与准静态近似理论的结果一致。
