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

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

© 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/vjbo/abstract.cfm?URI=josaa-31-1-135

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