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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 30 — Oct. 20, 2005
  • pp: 6479–6485

Discrete dipole approximation simulations of scattering by particles with hierarchical structure

Evgenij Zubko, Dmitry Petrov, Yuriy Shkuratov, and Gorden Videen  »View Author Affiliations

Applied Optics, Vol. 44, Issue 30, pp. 6479-6485 (2005)

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We use the discrete dipole approximation (DDA) method to calculate the intensity and the linear polarization degree of light scattered by agglomerated debris particles with hierarchical structure as functions of size parameter (varying from x = 2 to x = 14) and phase angle. Such structures are important, e.g., for cometary and interplanetary dust particles. Calculations for three combinations of refractive index were made, which correspond to regions of water ice, organic matter, and silicates. We examine the photometric and polarization properties of agglomerated particles with prefractal (Whitten–Sander model) and nonfractal porous structures of particle fragments formed by dipoles. We find that the aggregated particles can produce significant negative polarization at small phase angles. Increasing the packing density of dipoles and/or refractive index makes the negative polarization more prominent. The depth of the negative polarization branch depends on the type of internal structure: the negative polarization branch of particles having nonfractal structure is noticeably shallower in comparison with that of those having a prefractal structure. The negative polarization branch depth strongly depends on the imaginary part of the refractive index and increases with decreasing absorption. Polarization phase curves for agglomerated debris particles become smoother as the number of hierarchical levels increases.

© 2005 Optical Society of America

OCIS Codes
(260.5430) Physical optics : Polarization
(290.1090) Scattering : Aerosol and cloud effects
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering
(290.5870) Scattering : Scattering, Rayleigh

ToC Category:

Original Manuscript: February 22, 2005
Revised Manuscript: June 2, 2005
Manuscript Accepted: June 3, 2005
Published: October 20, 2005

Evgenij Zubko, Dmitry Petrov, Yuriy Shkuratov, and Gorden Videen, "Discrete dipole approximation simulations of scattering by particles with hierarchical structure," Appl. Opt. 44, 6479-6485 (2005)

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