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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 21, Iss. 10 — Oct. 1, 2004
  • pp: 2023–2028

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

Matthew J. Collinge and B. T. Draine  »View Author Affiliations

JOSA A, Vol. 21, Issue 10, pp. 2023-2028 (2004)

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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.

© 2004 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(240.0240) Optics at surfaces : Optics at surfaces
(260.2110) Physical optics : Electromagnetic optics
(290.5850) Scattering : Scattering, particles

Original Manuscript: November 12, 2003
Revised Manuscript: March 24, 2004
Manuscript Accepted: March 24, 2004
Published: October 1, 2004

Matthew J. Collinge and B. T. Draine, "Discrete-dipole approximation with polarizabilities that account for both finite wavelength and target geometry," J. Opt. Soc. Am. A 21, 2023-2028 (2004)

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