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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 1 — Jan. 1, 2014
  • pp: 135–140

Discrete-dipole approximation on a rectangular cuboidal point lattice: considering dynamic depolarization

Enrico Massa, Tyler Roschuk, Stefan A. Maier, and Vincenzo Giannini  »View Author Affiliations


JOSA A, Vol. 31, Issue 1, pp. 135-140 (2014)
http://dx.doi.org/10.1364/JOSAA.31.000135


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Abstract

Discrete-dipole approximation (DDA), which is used for computing scattering and absorption by particles of arbitrary geometry and material, is extended to the case of a rectangular cuboidal point lattice using an accurate, analytical expression of the polarizability of each cuboidal element at optical frequencies of up to 100 nm in size. This polarizability formulation (cuboidal lattice with depolarization or CLD) is shown to be more accurate in the computation of the extinction, scattering, and absorption cross sections when simulating dielectrics compared to other available and commonly used expressions of the polarizability. This can be used to reduce the number of dipoles N used, and therefore, the computation time while achieving the same accuracy of other formulations. The CLD formulation was applied to the Mie scattering problem and the results were compared to results from other DDA formulations, as well as to the Mie analytical solution for metal and dielectric spheres. Metal cubes were also simulated and different formulations compared.

© 2013 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.2110) Physical optics : Electromagnetic optics
(050.1755) Diffraction and gratings : Computational electromagnetic methods
(290.5825) Scattering : Scattering theory

ToC Category:
Scattering

History
Original Manuscript: October 22, 2013
Revised Manuscript: November 25, 2013
Manuscript Accepted: November 27, 2013
Published: December 16, 2013

Virtual Issues
Vol. 9, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Enrico Massa, Tyler Roschuk, Stefan A. Maier, and Vincenzo Giannini, "Discrete-dipole approximation on a rectangular cuboidal point lattice: considering dynamic depolarization," J. Opt. Soc. Am. A 31, 135-140 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-1-135

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