Light scattering by clusters

The A1-term method

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

This paper concerns the theoretical improvement of the discrete dipole approximation (DDA) to provide scattering properties of clusters of spherical monomers. The first scattering coefficient (a1-term) in Mie theory is introduced to determine the dipole polarizability used in the DDA. In the a1-term method, a spherical monomer in the cluster is replaced by a single dipole. The accuracy of this method is tested to calculate extinction and scattering cross sections by a single sphere, two-touching spheres and three collinear touching spheres. It is found that when each monomer is replaced by a dipole the a1-term method is superior to the different types of DDA, e.g., the Lattice Dispersion Relation (LDR), at least for the target with the volume equivalent size parameter X, 0.2≤X≤2. This method also allows treatment of a relatively large sub-volume element which is replaced by a dipole, i.e. the size parameter of the monomer Xm~1.5. Furthermore, a great reduction in memory requirement and computing time are achieved, e.g. for two touching spheres the a1-term method requires only 6% of the total memory requirement and 0.008% of the total computing time for N=8448 with the LDR.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalOptical Review
Volume2
Issue number6
DOIs
Publication statusPublished - Jan 1 1995
Externally publishedYes

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light scattering
dipoles
monomers
approximation
requirements
scattering coefficients
Mie scattering
scattering cross sections
extinction
scattering

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Light scattering by clusters : The A1-term method. / Okamoto, Hajime.

In: Optical Review, Vol. 2, No. 6, 01.01.1995, p. 407-412.

Research output: Contribution to journalArticle

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