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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 12 — Jun. 12, 2006
  • pp: 5746–5754

Discrete dipole approximation for magnetooptical scattering calculations

Damon A. Smith and Kevin L. Stokes  »View Author Affiliations

Optics Express, Vol. 14, Issue 12, pp. 5746-5754 (2006)

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Magneto-optical spectra (Faraday effect) for nanometer-scale particles and collections of particles are calculated using a modification of the discrete dipole approximation (DDA). The approximation is used as a finite-element method for non-spherical particles whose dimensions are on the order of or smaller than the incident light wavelength, λ. Also, we use the approximation to calculate scattering from arrangements of spherical nanoparticles with diameters ≪λ. We propose that for scattering from subwavelength magnetic particles, the specific Faraday rotation should be defined as the difference in optical extinction for left- and right-circularly polarized light. We apply the model to calculations of Faraday rotation from magnetite nanowires as well as a binary (two-component) nanoparticle arrangement. Enhancements in Faraday rotation are predicted for composites containing both noble metal and ferrite nanoparticles.

© 2006 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(160.3820) Materials : Magneto-optical materials
(290.5850) Scattering : Scattering, particles

ToC Category:

Original Manuscript: March 8, 2006
Revised Manuscript: May 9, 2006
Manuscript Accepted: May 11, 2006
Published: June 12, 2006

Damon A. Smith and Kevin L. Stokes, "Discrete dipole approximation for magneto-optical scattering calculations," Opt. Express 14, 5746-5754 (2006)

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