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Coupled dipole method for scatterers with large permittivity.

Patrick C Chaumet1, Anne Sentenac, Adel Rahmani

  • 1Institut Fresnel (UMR 6133), Universitié d'Aix-Marseille III, Av. Escadrille Normandie-Niemen, F-13397 Marseille Cedex 20, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 5, 2004
PubMed
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The coupled dipole method (CDM) for scattering objects is improved by integrating the free-space field susceptibility tensor over lattice cells. This enhances accuracy for objects with high permittivity, refining the polarizability prescription in CDM.

Area of Science:

  • Computational electromagnetics
  • Electromagnetic scattering theory

Background:

  • The coupled dipole method (CDM) models scattering objects by discretizing them into polarizable units.
  • Accurate modeling of electromagnetic scattering is crucial in various scientific and engineering fields.

Purpose of the Study:

  • To enhance the accuracy of the coupled dipole method (CDM) for large permittivity objects.
  • To develop an approximation-free method for calculating polarizability in CDM.

Main Methods:

  • Derived the volume integral equation for the electromagnetic field.
  • Performed an exact integration of the free-space field susceptibility tensor over lattice cells.
  • Defined a new prescription for polarizability within the CDM framework.

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Main Results:

  • Demonstrated that integrating the susceptibility tensor over lattice cells significantly improves CDM accuracy for high-permittivity objects.
  • The proposed method is exact and does not rely on approximations.
  • The derivation is independent of scatterer shape and lattice type.

Conclusions:

  • The refined CDM offers a more accurate and robust approach for simulating electromagnetic scattering.
  • This method provides a generalized prescription for polarizability applicable to diverse scattering scenarios.