Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1998-12-04
Eur. Phys. J. B 7 (1999), 483
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
31 pages, 2 tables, 7 figures. To appear in Eur. J. Phys. B
Scientific paper
10.1007/s100510050636
The diffuse intensity propagating in turbid media is sensitive to the presence of any kind of object embedded in the medium, e.g. obstacles or defects. The long-ranged effects of isolated objects can be described by a stationary diffusion equation, the effect of any single object being parametrized in terms of a multipole expansion. An absorbing object is chiefly characterized by a negative charge, while the leading effect of a non-absorbing object is due to its dipole moment. The associated intrinsic characteristics of the object (capacitance $Q$ or effective radius $R_{\rm eff}$, polarizability $P$) can be evaluated within the diffusion approximation for large enough objects. The situation of mesoscopic objects, with a size comparable to the mean free path, requires a more careful treatment, for which the appropriate framework is radiative transfer theory. This formalism is worked out in detail for spheres and cylinders of the following kinds: totally absorbing (black), transparent, and totally reflecting.
Luck Mck. J.
Nieuwenhuizen Th. M.
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