We performed experiments to study the extinction, scattering, and polarization of light by ensembles of fractal dust aggregates that consist of spherical monomers large compared with the wavelength. Extinction was measured on a homogeneous dust cloud. Scattering and polarization were measured on a collimated dust beam. We found that polarization and extinction are determined only by a small size scale that is defined by a monomer and its closest neighbors in an aggregate. The scattering function might also depend on the overall size of the aggregate or the total number of monomers in an aggregate.
© 2002 Optical Society of America
Original Manuscript: June 7, 2001
Revised Manuscript: October 15, 2001
Published: February 20, 2002
Martin Schnaiter and Gerhard Wurm, "Experiments on light scattering and extinction by small, micrometer-sized aggregates of spheres," Appl. Opt. 41, 1175-1180 (2002)