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

Abstract

The light scattering characteristics of nanographite 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 nanographite aggregates and the changes of polarization along with the scattering angles, and the light scattering characteristics of nanographite aggregates were compared with the equal volume spherical nanographite particles. The computing results show that the non-spherical complex shape of nanographite 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 nanographite aggregates is obviously stronger than the equal volume spherical nanographite particles.