Absorption and Scattering of the Aggregated Multi-Layered Nanoshells

A generalized mathematical formulation is presented for multi-scattering of electromagnetic fields by an ensemble consisting of arbitrarily-positioned multilayered nanoshells. The model is developed by combining the addition theorem and the efficient recursive procedure for multilayered nanoshells and general procedures for computing the multiple scattered fields and optical properties of the particle ensemble are presented. The enhancement of the electric field and the energy absorbed by the aggregated silica-gold nanoshell and gold-silica-gold nanoshells are analyzed to understand the physics governing the electromagnetic field interaction with aggregated multilayered nanoshells. The mathematical model should be helpful in providing valuable information on optical and radative transfer characteristics needed for the nanoshell-based applications in photothermal therapy, biomedical imaging, biosensing and waveguide for energy transport.