用离散偶极近似理论研究银纳米粒子的消光光谱与介电环境的关系

Dependence of the local medium dielectric constant on the extinction spectrum of silver nanoparticles with DDA method

利用离散偶极近似(DiscreteDipoleApproximation,简称DDA)的方法,分别计算一定尺度的球状、棒状和椭球状银纳米粒子在不同介电环境下的消光光谱.结果表明,银纳米粒子的最大消光位置随所处介电环境折射率的增加呈现明显的红移现象,两者之间的关系大体呈线性.

Based on the discrete dipole approximation (DDA) method, the extinction spectrum of the silver nanosphere, nanorod and nanoellipsoid are calculated. the effect of solvent with different dielectric constant on the extinction spectrum is examined. The calculation result shows that the maximum of the extinction spectrum depends on the refractive index in a linear way.