Maximum coefficient of light extinction in a nonabsorbing dispersive medium |
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Authors: | V P Dick |
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Institution: | (1) Stepanov Institute of Physics, Belarussian Academy of Sciences, Minsk, 220072, Belarus |
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Abstract: | The maximum value of the light extinction coefficient μ, which can be observed in a dispersive medium with a relative refractive index n of the scattering particles, is studied within the framework of a quasi-crystalline approximation for nonabsorbing dispersive media consisting of monodisperse spherical scatterers. A change in the diffraction parameter x of the scattering particles and their volume concentration c v is accompanied by nonmonotonic variations of the extinction coefficient, and the function μ(x, c v ) exhibits several maxima. The dimensions and concentrations of particles are determined, for which the extinction coefficient reaches the absolute maximum μmax. The μmax value exhibits a monotonic growth with increasing relative refractive index n of the scattering particles. The conditions of validity of the Ioffe-Regel criterion of radiation localization have been studied. It is established that the localization in nonabsorbing dispersive media can be observed only for n ? 2.7. The intervals of x and c v in which the criterion of radiation localization is satisfied in dispersive media consisting of particles with n = 3.0 and 3.5 are determined. |
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