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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 11, Iss. 11 — Nov. 1, 1994
  • pp: 2851–2861

Calculation of total cross sections of multiple-sphere clusters

Daniel W. Mackowski  »View Author Affiliations

JOSA A, Vol. 11, Issue 11, pp. 2851-2861 (1994)

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A method for calculating the extinction, absorption, and scattering cross sections of clusters of neighboring spheres for both fixed and random orientations is developed. The analysis employs the superposition formulation for radiative interactions among spheres, in which the total field from the cluster is expressed as a superposition of vector spherical harmonic expansions about each of the spheres in the cluster. Through the use of addition theorems a matrix equation for the expansion coefficients is obtained. Further application of addition theorems on the inverse of the coefficient matrix is shown to yield analytical expressions for the orientation-averaged total cross sections of the sphere cluster. Calculations of the cross sections of pairs of spheres and fractal aggregates of several spheres are presented. It is found that a dipole representation of the field in each sphere does not adequately predict the absorption cross section of clusters of small-size-parameter spheres when the spheres are highly conducting. For this situation several multipole orders are required for an accurate calculation of the absorption cross section. In addition, the predicted absorption of sphere clusters can be significantly greater than that estimated from the sum of the isolated-sphere cross sections.

© 1994 Optical Society of America

Original Manuscript: April 23, 1993
Revised Manuscript: June 23, 1994
Manuscript Accepted: June 23, 1994
Published: November 1, 1994

Daniel W. Mackowski, "Calculation of total cross sections of multiple-sphere clusters," J. Opt. Soc. Am. A 11, 2851-2861 (1994)

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