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Light scattering from mesoscopic objects in diffusive media | | J.M. Luck
; Th.M. Nieuwenhuizen
; | | Date: |
4 Dec 1998 | | Journal: | Eur. Phys. J. B 7 (1999), 483 | | Subject: | Mesoscopic Systems and Quantum Hall Effect; Statistical Mechanics | cond-mat.mes-hall cond-mat.stat-mech | | Affiliation: | Saclay) and Th.M. Nieuwenhuizen (Amsterdam | | Abstract: | 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 $R_{
m eff}$, 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. | | Source: | arXiv, cond-mat/9812071 | | Services: | Forum | Review | PDF | Favorites | |
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