Light scattering by nonspherical particles: a refinement to the coupled-dipole method

Abstract

In the coupled-dipole method an arbitrary particle is modeled as an array of N polarizable subunits, each of which gives rise to only electric dipole radiation. The Clausius-Mosotti relation is widely used to calculate the polarizability of the subunits that correspond to the dielectric function of the particle that the array represents. We replace the Clausius-Mosotti relation with an exact expression for the electric dipole polarizability and find improvement in extinction calculations for spheres as compared with Mie theory. Near a Fröhlich frequency the coupled-dipole method yields extinction cross sections for spheres and spheroids that compare favorably with the continuous distribution of ellipsoids method and measured values.

© 1991 Optical Society of America

Light scattering by an arbitrary particle: the scattering-order formulation of the coupled-dipole method

Shermila Brito Singham and Craig F. Bohren
J. Opt. Soc. Am. A 5(11) 1867-1872 (1988)

Comparisons of coupled-dipole solutions and dipole refractive indices for light scattering and absorption by arbitrarily shaped or agglomerated particles

Jerry C. Ku
J. Opt. Soc. Am. A 10(2) 336-342 (1993)

Multidipole formulation of the coupled dipole method for electromagnetic scattering by an arbitrary particle

C. Bourrely, P. Chiappetta, T. Lemaire, and B. Torrésani
J. Opt. Soc. Am. A 9(8) 1336-1340 (1992)

Calculation of light scattering from particles and structures on a surface by the coupled-dipole method

Marc A. Taubenblatt and Tuyen K. Tran
J. Opt. Soc. Am. A 10(5) 912-919 (1993)

Discrete dipole moment method for calculation of the T matrix for nonspherical particles

Daniel W. Mackowski
J. Opt. Soc. Am. A 19(5) 881-893 (2002)