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Adding local short description: "Way of computing radiation scattering", overriding Wikidata description "method for computing scattering of radiation by particles of arbitrary shape" |
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{{Short description|Way of computing radiation scattering}}
[[File:Shape DDA1.svg|thumb|upright=1.2|In the discrete dipole approximation, a larger object is approximated in terms of discrete radiating electric dipoles.]]
'''Discrete dipole approximation''' ('''DDA'''), also known as '''coupled dipole approximation''',<ref name=singham1986/> is a method for computing [[scattering]] of radiation by particles of arbitrary shape and by periodic structures. Given a target of arbitrary geometry, one seeks to calculate its scattering and absorption properties by an approximation of the continuum target by a finite array of small [[Polarizability|polarizable]] [[Dipole#Dipole radiation|dipoles]]. This technique is used in a variety of applications including [[nanophotonics]], [[radar]] scattering, [[aerosol]] physics and [[astrophysics]].
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