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The computation of light scattering by the superposition T-matrix scheme hasbeen so far restricted to systems made of particles that are either sparselydistributed or of near-spherical shape. In this work, we extend the range ofapplicability of the T-matrix method by accounting for the coupling ofscattered fields between highly non-spherical particles in close vicinity. Thisis achieved using an alternative formulation of the translation operator forspherical vector wave functions, based on a plane wave expansion of theparticle's scattered electromagnetic field. The accuracy and versatility of thepresent approach is demonstrated by simulating arbitrarily oriented and denselypacked spheroids, for both, dielectric and metallic particles.

Plane wave coupling formalism for T-matrix simulations of light scattering by non-spherical particles