title: Polarized backscattering by clusters of spherical particles.
abstract: The linear and circular polarization ratios for clusters of spherical particles averaged over multiple orientations show a systematic pattern as a function of the refractive index and the size parameter. We show that, at backscattering, the depolarizing behavior of orientation-averaged clusters of spheres can be approximated by second-order scattering of bispheres. The pattern is relatively invariable in terms of the number of particles. We also demonstrate the significance of the near-field effects for polarization at backscattering.
authors.forename: Anne
authors.initials: A
authors.lastname: Virkki
authors.forename: Johannes
authors.initials: J
authors.lastname: Markkanen
authors.forename: Jani
authors.initials: J
authors.lastname: Tyynelä
authors.forename: Jouni I
authors.initials: JI
authors.lastname: Peltoniemi
authors.forename: Karri
authors.initials: K
authors.lastname: Muinonen