OPTICAL-PROPERTIES OF MODEL ANISOTROPIC PARTICLES ON OR NEAR A PERFECTLY REFLECTING SURFACE

In the framework of image theory the full scattering pattern from mode l anisotropic particles on a perfectly reflecting surface is calculate d for an arbitrary direction of the incident field. The particles on t he surface are modeled either as clusters of spherical scatterers or a s clusters of hemispheres whose flat faces lie on the reflecting surfa ce. Our approach is based on the expansion of all the fields in terms of spherical multipoles whose transformation properties are used to yi eld a compact expression for the scattered intensity both from a singl e particle as a function of its orientation and from a dispersion of r andomly oriented particles. The patterns that were calculated for seve ral model scatterers show some features that may provide useful inform ation about the possible anisotropy of actual particles on a reflectin g surface.