Our previous theory for calculating the scattering pattern from single spheres in the vicinity of a dielectric substrate [J. Opt. Soc. Am. A 14, 1505 (1997)] is extended to the case of aggregated spheres. This extension preserves our main result that a nonvanishing field, though somewhat attenuated when the substrate is absorptive, can propagate along the interface; this feature is apparent in the patterns from all the aggregates that we considered. The effects that can be expected when scattering particles on the dielectric surface either aggregate or undergo some kind of subdivision are investigated by comparing the pattern from a sphere containing a chosen volume V of a given refractive material with the pattern from the aggregate of two such spheres and with the pattern from two aggregated spheres of the same material, each of volume V/2.

© 1999 Optical Society of America

[Optical Society of America ]

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