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Radiation forces in the discrete-dipole approximation.

A G Hoekstra1, M Frijlink, L B Waters

  • 1Section Computational Science, University of Amsterdam, The Netherlands. alfons@science.uva.nl

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|August 8, 2001
PubMed
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This study extends the discrete-dipole approximation (DDA) to calculate light scattering radiation forces on individual dipoles. The new method provides accurate force calculations comparable to Mie theory for spherical particles.

Area of Science:

  • Computational physics
  • Electromagnetism
  • Light scattering

Background:

  • The discrete-dipole approximation (DDA) is a powerful method for simulating light scattering by particles.
  • Calculating radiation forces within the DDA framework has been a computational challenge.

Purpose of the Study:

  • To extend the discrete-dipole approximation (DDA) to compute radiation forces on individual dipoles.
  • To develop an efficient computational method for evaluating these forces.
  • To validate the accuracy of the DDA-based force calculations.

Main Methods:

  • Derivation of radiation force expressions for each dipole based on Draine and Weingartner's theory.
  • Reformulation of force expressions into discrete convolutions for efficient computation (O(N logN)).

Related Experiment Videos

  • Summation of individual dipole forces to obtain total radiation pressure.
  • Comparison with Mie theory for spherical particles.

    • Main Results:

    • An efficient O(N logN) method for calculating dipole radiation forces within the DDA framework.
    • Accurate computation of total radiation pressure for spherical particles.
    • Results show agreement with Mie theory within a few percent accuracy.

    Conclusions:

    • The extended DDA provides an accurate and efficient method for calculating light scattering radiation forces.
    • This advancement enables more precise simulations of radiation pressure effects in various physical systems.
    • The method's accuracy is comparable to established techniques like Mie theory for extinction cross sections.