The Angular Distribution of Scattering Intensity And Polarization for Nano-Graphite Aggregates

摘要

The light scattering characteristics of nano-graphite aggregates are analyzed in this paper. Three dimensional fractal structures of aggregates were simulated based on the diffusion-limited aggregation model (DLA). For the incident wave of different wavelength, the method of discrete dipole approximation (DDA) was used to compute the light scattering intensity of nano-graphite aggregates and the changes of polarization along with the scattering angles, and the light scattering characteristics of nano-graphite aggregates were compared with the equal volume spherical nano-graphite particles. The computing results show that the non-spherical complex shape of nano-graphite aggregates has great effect on the scattering characteristics in the visible and near-infrared, and the angle distribution of scattering intensity and polarization have many complex changes. The forward scattering intensity of nano-graphite aggregates is obviously stronger than the equal volume spherical nano-graphite particle's.