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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry M. Van Driel
  • Vol. 25, Iss. 10 — Oct. 1, 2008
  • pp: 1728–1737

Resonant light scattering by small coated nonmagnetic spheres: magnetic resonances, negative refraction, and prediction

Cheng-Wei Qiu and Lei Gao  »View Author Affiliations


JOSA B, Vol. 25, Issue 10, pp. 1728-1737 (2008)
http://dx.doi.org/10.1364/JOSAB.25.001728


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Abstract

Light scattering of individual coated nonmagnetic spherical particles and effective parameters for a collection of such inclusions are studied at terahertz frequencies, with the emphasis on the conditions of achieving resonant light scatterings, induced magnetic resonance, and negative refraction. Moreover, the prediciton of those critical conditions is proposed. Different core–shell combinations aiming at inducing magnetic resonances are investigated, including plasmonic metamaterials and polar crystals. It is shown that the resonant scattering is controllable with fine adjustment of the core–shell ratio, varying from enhancement to suppression in the scattering drastically. Embedding identical coated nanospheres in a matrix, the polarizability and effective medium parameters of the bulk are examined to give better understanding of unusual scatterings and their predictions. The resonances in electric and magnetic dipole approximation for such a bulk medium are presented.

© 2008 Optical Society of America

OCIS Codes
(260.2030) Physical optics : Dispersion
(260.2110) Physical optics : Electromagnetic optics
(260.3090) Physical optics : Infrared, far
(290.1350) Scattering : Backscattering
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Scattering

History
Original Manuscript: May 28, 2008
Revised Manuscript: August 4, 2008
Manuscript Accepted: August 5, 2008
Published: September 26, 2008

Citation
Cheng-Wei Qiu and Lei Gao, "Resonant light scattering by small coated nonmagnetic spheres: magnetic resonances, negative refraction, and prediction," J. Opt. Soc. Am. B 25, 1728-1737 (2008)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-25-10-1728


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