Open AccessGiant omnidirectional radiation enhancement via radially anisotropic zero-index metamaterial
Author(s) -
Neng Wang,
Huajin Chen,
Wanli Lu,
Shiyang Liu,
Zhen Lin
Publication year - 2013
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.023712
Subject(s) - optics , metamaterial , physics , isotropy , mie scattering , radiation , scattering , dielectric , omnidirectional antenna , anisotropy , transition radiation , radiation properties , light scattering , optoelectronics , telecommunications , computer science , antenna (radio)
We demonstrate a remarkable enhancement of isotropic radiation via radially anisotropic zero-index metamaterial (RAZIM). The radiation power can be enhanced by an order of magnitude when a line source and a dielectric particle is enclosed by a RAZIM shell. Based on the extended Mie theory, we illustrate that the basic physics of this isotropic radiation enhancement lies in the confinement of higher order anisotropic modes by the RAZIM shell. The confinement results in some high field regions within the RAZIM shell and thus enables strong scattering from the dielectric particle therein, giving rise to a giant amplification of isotropic radiation out of the system. The influence of the loss inherent in the RAZIM shell is also examined. It is found that the attenuation of omnidirectional power enhancement due to the loss in the RAZIM can be compensated by gain particles.