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Effective medium approach to the dynamic optical response of a graded index plasmonic nanoparticle |
JOSA B, Vol. 29, Issue 5, pp. 970-976 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000970
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Abstract
The optical response of graded index spherical particles is studied using an effective medium approach, where the homogenization of the graded particle is achieved by using a static effective dielectric function available in the literature. Full-wave calculation using the standard Mie theory for this “homogenized system” shows that for a plasmonic particle, such an approximation can lead to highly-accurate results compared to the exact ones, especially for slowly and smoothly varying index profiles. An illustration is provided via an application of this method to the design of an optical cloak using a graded plasmonic coating based on the scattering cancellation scheme. This approach thus surpasses the various long-wavelength approximations currently available in the literature and provides an efficient numerical treatment of light scattering from these inhomogeneous particles without having to solve directly the Maxwell’s equations with spatially varying dielectric functions.
© 2012 Optical Society of America
OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(290.2200) Scattering : Extinction
(290.4020) Scattering : Mie theory
(260.2065) Physical optics : Effective medium theory
(160.2710) Materials : Inhomogeneous optical media
ToC Category:
Materials
History
Original Manuscript: December 6, 2011
Manuscript Accepted: January 4, 2012
Published: April 12, 2012
Virtual Issues
Vol. 7, Iss. 7 Virtual Journal for Biomedical Optics
Citation
H. Y. Chung, P. T. Leung, and D. P. Tsai, "Effective medium approach to the dynamic optical response of a graded index plasmonic nanoparticle," J. Opt. Soc. Am. B 29, 970-976 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-5-970
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