Abstract

We propose a new formalism for computing the optical properties of small clusters of particles. It is a generalization of the coupled dipole–dipole particle-interaction model and allows one in principle to take into account all multipolar interactions in the long-wavelength limit. The method is illustrated by computations of the optical properties of N=6 particle clusters for different multipolar approximations. We examine the effect of separation between particles and compare the optical spectra with the discrete-dipole approximation and the generalized Mie theory.

© 2002 Optical Society of America

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