Discrete-dipole approximation with polarizabilities that account for both finite wavelength and target geometry

Matthew J. Collinge, B. T. Draine

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

The discrete-dipole approximation (DDA) is a powerful method for calculating absorption and scattering by targets that have sizes smaller than or comparable with the wavelength of the incident radiation. We present a new prescription - the surface-corrected-lattice-dispersion relation (SCLDR) - for assigning the dipole polarizabilities while taking into account both target geometry and finite wavelength. We test the SCLDR in DDA calculations for spherical and ellipsoidal targets and show that for a fixed number of dipoles, the SCLDR prescription results in increased accuracy in the calculated cross sections for absorption and scattering. We discuss extension of the SCLDR prescription to irregular targets.

Original languageEnglish (US)
Pages (from-to)2023-2028
Number of pages6
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume21
Issue number10
DOIs
StatePublished - Oct 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition

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