Abstract
The optical properties of fractal aggregates and effects of multiple scattering are studied using computer-generated clusters whose structures are known. We show that the dominant effect of multiple scattering is reflected in the mean-field index of refraction of the clusters. By contrast, multiple scattering does not mask the q dependence of the scattering, even when the polarizability of each particle is large, and when df > 2, so that the cluster is geometrically opaque. In addition, we show that, in spite of the aggregates’ generally low density, the connected structure necessarily imposes significant high-order multipole interactions between each particle and its nearest neighbors. For metal particles, this results both in the appearance of a second red-shifted absorption peak as distinct from the single-particle Mie resonance as well as strong depolarized scattering.
© 1987 Optical Society of America
PDF ArticleMore Like This
Ping Sheng, Z. Chen, H. M. Lindsay, D. A. Weitz, and P. Meakin
FN6 OSA Annual Meeting (FIO) 1986
Ping Sheng, Z. Chen, H. M. Lindsay, D. A. Weitz, and P. Meakin
FN6 International Laser Science Conference (ILS) 1986
Yu. E. Danilova, A. I. Plekhanov, S. G. Rautian, V. P. Safonov, V. V. Shelkovnikov, and F. A. Zhuravlev
QTuG59 European Quantum Electronics Conference (EQEC) 1994