Top-down, decoupled control of constitutive parameters in electromagnetic metamaterials with dielectric resonators of internal anisotropy.

ABSTRACT: A meta-atom platform providing decoupled tuning for the constitutive wave parameters remains as a challenging problem, since the proposition of Pendry. Here we propose an electromagnetic meta-atom design of internal anisotropy (?_r????_?), as a pathway for decoupling of the effective- permittivity ?_eff and permeability ?_eff. Deriving effective parameters for anisotropic meta-atom from the first principles, and then subsequent inverse-solving the obtained decoupled solution for a target set of ?_eff and ?_eff, we also achieve an analytic, top-down determination for the internal structure of a meta-atom. To realize the anisotropy from isotropic materials, a particle of spatial permittivity modulation in r or ? direction is proposed. As an application example, a matched zero index dielectric meta-atom is demonstrated, to enable the super-funneling of a 50?-wide flux through a sub-? slit; unharnessing the flux collection limit dictated by the ?-zone.

SUBMITTER: Koo S 

PROVIDER: S-EPMC5301205 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature