Fluctuations of light scattered by fractal clusters
نویسندگان
چکیده
Fluctuations in light scattering from a finite ensemble of fractal clusters are studied numerically and theoretically. It is shown that, for a wide range of wavelengths and angles, relative fluctuations in the scattered intensity are very close to 1 and do not depend on the number of monomers N in fractal clusters (whereas they are proportional to 1/AN for trivial clusters). The relations describing fluctuations in the light scattering are suggested; they can be used to extract important information about properties and parameters of fractal pollutants in the atmosphere. © 1997 Optical Society of America. [S0740-3232(97)02001-2]
منابع مشابه
Nonlinear light scattering from clusters and single particles.
We present sum-frequency-scattering experiments on colloidal dispersions with various concentrations and in different scattering geometries. At small scattering angles, large fluctuations are observed in the intensity of the scattered sum-frequency photons. By considering the angular dependence of the signal, the particle concentration dependence, and the surface vibrational spectra of the part...
متن کاملCalcium-dependent mechanical oscillations occur spontaneously in unstimulated mammalian cardiac tissues.
In quiescent rat ventricular myocardium, bathed in solution of 2 mM Ca++ or less, it has been previously demonstrated that spontaneous microscopic oscillatory cell motion is present and interacts with an incident laser beam to produce scattered light intensity fluctuations which can be monitored to quantify the underlying motion. The present study shows that scattered light intensity fluctuatio...
متن کاملPore surface fractal dimension of sol-gel derived nanoporous SiO2-ZrO2 membrane
In this work, SiO2 –ZrO2 mixed oxides was prepared by the polymeric sol–gel route. The characterization of pore structure, which determines the permeation process of membrane, is of great importance. So far, most investigations have focused on such pore structure as specific surface area and pore size distribution, but the surface fractal, the important parameter reflecting the roughness of por...
متن کاملLocal Fields' Localization and Chaos and Nonlinear- Optical Enhancement in Composites
The paper is devoted to linear and nonlinear optical properties of disordered clusters and nanocomposites. Linear and nonlinear optical polarizabilities of large disordered clusters, fractal clusters in particular, and susceptibilities of nanocomposites are found and calculated numerically. A spectral theory with dipole interaction is used to obtain quantitative results. Major properties of sys...
متن کاملChange of diffused and scattered light with surface roughness of p-type porous Silicon
Porous silicon samples were prepared by electrochemical etching method for different etching times. The structural properties of porous silicon (PS) samples were determined from the Atomic Force Microscopy (AFM) measurements. The surface mean root square roughness (σ rms) changes as function of porosity were studied, and the influence of etching time on porosity and roughness was studied too. U...
متن کامل