基于Bruggerman理论的双金属合金光学特性研究

Theoretical Calculations on the Light Behavior of Bimetallic Nanoparticles with Bruggerman Theory

双金属合金纳米颗粒基于杂化的表面等离子共振特性表现出优异的光学性能,因而利用Bruggerman理论研究双金属合金的光学调控特性,在准静态近似下计算双金属合金的光学消光系数、吸收系数、反射率和透射率,通过调节复合双金属合金的体积分数,体系的共振峰得到有效调节.结果表明,该研究方法是一种简单、快速、有效的方法,不需要求解复杂的微分方程,仅仅通过改变体积分数和颗粒周围的介电常数即可以实现光谱的调节.

Bimetallic nanoparticles exhibied optical properties that differ significantly from those of the bulk material due to hybrid surface plasmon resonance. With the quasi-static approximation, the behavior of the light propagation was investigated. Resorting to the Bruggernan theory, the extinction coefficient, absorption coefficient, reflection, transmittance and refraction were theoretically investigated. Our results showed that by tuning the volume fraction of the metallic nanoparticles, its resonant peak could be tuned as accordingly. This calculation method can significantly improve the computing efficiency.