  Light scattering and spin-orbit angular momentum coupling phenomena from
subwavelength objects, with electric and magnetic dipolar responses, are
receiving an increasing interest. Under illumination by circularly polarized
light, spin-orbit coupling effects have been shown to lead to significant
shifts between the measured and actual position of particles. Here we show that
the remarkable angular dependence of these "optical mirages" and those of the
intensity, degree of circular polarization (DoCP), and spin and orbital angular
momentum of scattered photons, are all linked and fully determined by the
dimensionless "asymmetry parameter" g, being independent of the specific
optical properties of the scatterer. Interestingly, for g different from 0, the
maxima of the optical mirage and angular momentum exchange take place at
different scattering angles. In addition we show that the g parameter is
exactly half of the DoCP at a right-angle scattering. This finding opens the
possibility to infer the whole angular properties of the scattered fields by a
single far-field polarization measurement.
