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采用离散偶极子近似方法(discrete dipoleapproximation,简称DDA)从理论上对玻璃基底上不同粒径的Au纳米粒子结构阵列的消光光谱以及消光峰与纳米粒子粒径的关系进行了研究。计算结果显示玻璃基底上的Au纳米粒子结构阵列的消光谱中出现明显区别于Au单体纳米粒子的共振峰,玻璃基底上的Au纳米粒子结构阵列的消光性质与单体纳米粒子的粒径密切相关,随着纳米粒径的增大表面等离子体共振吸收峰出现明显红移,并且在粒径>40nm时出现多峰吸收现象。计算结果与实验结果基本一致。给出玻璃基底上的Au纳米粒子结构阵列的共振吸收峰随单体纳米粒子粒径变化的关系图。对Au纳米结构阵列的吸收机制进行系统的理论分析。
The discrete extinction approximation (DDA) was used to theoretically study the extinction spectra and the relationship between the extinction peak and the particle size of Au nanoparticles on different glass substrates. The calculated results show that the extinction spectrum of the Au nanoparticles on the glass substrate is obviously different from that of the Au nanoparticles. The extinction properties of the Au nanoparticles on the glass substrate are close to those of the nanoparticles , The surface plasmon resonance absorption peak shows a significant red shift with the increase of nanoparticle size, and the phenomenon of multimodal absorption occurs when the particle size is> 40nm. The calculated results are in good agreement with the experimental results. The relationship between the resonance absorption peak of the array of Au nanoparticles on the glass substrate and the particle size of the monomer nanoparticles is given. The absorption mechanism of Au nanostructure array is systematically and theoretically analyzed.