Many-Body Iterative T-matrix (MBIT) method

The T-matrix method is effective for particles with rotational symmetry. However, the current T-matrix method can only get the scattering properties of the small particles with the aspect ratio far deviated from 1 relative to the ones with the aspect ratio close to 1. In this study, a new iterative T-matrix method has been proposed to deal with prolate particles. The basic idea is to divide the single particle into several pieces. For each piece, the transition matrix can be obtained in terms of the current T-matrix method. Then using these transition matrices and a series of iterative equations derived from the extended boundary condition method (EBCM) and the addition theorem, we can get the final results. This method can deal with not only single prolate particles but also aggregate particles whose smallest circumscribing spheres do not intersect each other. Moreover, it can also be applied to particles with different refractive indices in different pieces or different single particles.