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Discrete dipole approximation
The discrete dipole approximation (DDA) - is a method for computing scattering of radiation by particles of arbitrary shape.
Additional recommended knowledge
The discrete-dipole approximation (DDA) is a flexible technique for computing scattering and absorption by targets of arbitrary geometry. Given a target of arbitrary geometry, one seeks to calculate its scattering and absorption properties. Exact solutions to Maxwell's equations are known only for special geometries such as spheres, spheroids, or infinite cylinders, so approximate methods are in general required. The DDA is one such method. Simply stated, the DDA is an approximation of the continuum target by a finite array of polarizable points. The points acquire dipole moments in response to the local electric field. The dipoles of course interact with one another via their electric fields, so the DDA is also sometimes referred to as the coupled dipole approximation.
This method was originally proposed by E. M. Purcell and C. R. Pennypacker and subsequently developed by B. T. Draine and P. J. Flatau.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Discrete_dipole_approximation". A list of authors is available in Wikipedia.|