Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Electromagnetic energy within coated spheres containing dispersive metamaterials

Full text
Author(s):
Arruda, Tiago J. [1] ; Pinheiro, Felipe A. [2] ; Martinez, Alexandre S. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Pret, BR-14040901 Ribeirao Preto - Brazil
[2] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Optics; v. 14, n. 6 JUN 2012.
Web of Science Citations: 12
Abstract

An exact expression is derived for the time-averaged electromagnetic energy within a magneto-dielectric coated sphere, which is irradiated by a plane and time-harmonic electromagnetic wave. Both the spherical shell and core are considered to be dispersive and lossy, with a realistic dispersion relation of an isotropic split-ring resonator metamaterial. We obtain analytical expressions for the stored electromagnetic energies inside the core and the shell separately and calculate their contributions to the total average energy density. The stored electromagnetic energy is calculated for two situations involving a metamaterial coated sphere: a dielectric shell and dispersive metamaterial core, and vice versa. An explicit relation between the stored energy and the optical absorption efficiency is also obtained. We show that the stored electromagnetic energy is an observable sensitive to field interferences responsible for the Fano effect. This result, together with the fact that the Fano effect is more likely to occur in metamaterials with negative refraction, suggest that our findings may be explored in applications. (AU)

FAPESP's process: 08/02069-0 - Electromagnetic wave scattering by magnetic spheres and cylinders: waves confinement and transport in the small particle limit and independence of the stored energy with respect to the shape of the scatterer
Grantee:Tiago José Arruda
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 10/10052-0 - Internal energy and electromagnetic wave scattering by spheres or cylinders: Fano resonances and their applications to metamaterials
Grantee:Tiago José Arruda
Support Opportunities: Scholarships in Brazil - Doctorate