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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 27, Iss. 5 — May. 1, 2010
  • pp: 1083–1091

Coupled magnetic dipole resonances in sub-wavelength dielectric particle clusters

Mark S. Wheeler, J. Stewart Aitchison, and Mohammad Mojahedi  »View Author Affiliations


JOSA B, Vol. 27, Issue 5, pp. 1083-1091 (2010)
http://dx.doi.org/10.1364/JOSAB.27.001083


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Abstract

Dielectric spheres which are much smaller than a wavelength and made of a large permittivity can support magnetic dipole modes of great purity. We investigate the coupling of such magnetic dipoles by studying sub-wavelength dielectric spheres arranged in clusters as pairs, chains, and rings. The coupling among the spheres creates hybridized modes, which may be used to engineer metamaterials with more degrees of freedom than by using single particles. Two methods of analysis are used: an approximate coupled dipole model and an exact transition-matrix approach. An experimental setup employs a focused Gaussian beam excitation. The magnetic coupling presented here is similar to the coupling of plasmonic modes in metal nanoparticles. Therefore, these experimental results are also a verification of several analogous plasmonic systems.

© 2010 Optical Society of America

OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(290.4020) Scattering : Mie theory
(290.4210) Scattering : Multiple scattering
(160.3918) Materials : Metamaterials

ToC Category:
Materials

History
Original Manuscript: November 18, 2009
Revised Manuscript: February 12, 2010
Manuscript Accepted: March 12, 2010
Published: April 28, 2010

Citation
Mark S. Wheeler, J. Stewart Aitchison, and Mohammad Mojahedi, "Coupled magnetic dipole resonances in sub-wavelength dielectric particle clusters," J. Opt. Soc. Am. B 27, 1083-1091 (2010)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-27-5-1083


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