Open AccessFast near field calculations in the discrete dipole approximation for regular rectilinear grids
Author(s) -
Piotr J. Flatau,
B. T. Draine
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.001247
Subject(s) - discrete dipole approximation , optics , electric field , scattering , fast fourier transform , dipole , fourier transform , physics , field (mathematics) , light scattering , computational physics , forward scatter , algorithm , mathematics , quantum mechanics , pure mathematics
A near-field calculation of light electric field intensity inside and in the vicinity of a scattering particle is discussed in the discrete dipole approximation. A fast algorithm is presented for gridded data. This algorithm is based on one matrix times vector multiplication performed with the three dimensional fast Fourier transform. It is shown that for moderate and large light scattering near field calculations the computer time required is reduced in comparison to some of the other methods.