Effective medium approach to the dynamic optical response of a graded index plasmonic nanoparticle

H.Y. Chung, P.T. Leung, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)970-976
Number of pages7
JournalJournal of the Optical Society of America B: Optical Physics
Volume29
Issue number5
DOIs
Publication statusPublished - 1 May 2012
Externally publishedYes

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Atomic and Molecular Physics, and Optics

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