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cda: Coupled dipole approximation of light scattering by clusters of nanoparticles

Solves the electromagnetic problem of coupled-dipoles (scattering and absorption by a cluster of subwavelength particles in arbitrary 3D configuration) by setting up the interaction matrix and solving the linear system for multiple incident fields. Functions are provided for linear polarisation as well as circular polarisation with full angular averaging (optical activity). Retardation is included in the dipole-dipole interaction.