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Published February 10, 2017 | Published
Journal Article Open

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 (ε_r ≠ ε_θ), as a pathway for decoupling of the effective- permittivity ε_(eff) and permeability μ_(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 ε_(eff) and μ_(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 θ direction is proposed. As an application example, a matched zero index dielectric meta-atom is demonstrated, to enable the super-funneling of a 50λ-wide flux through a sub-λ slit; unharnessing the flux collection limit dictated by the λ-zone.

Additional Information

© The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ Received: 04 November 2016. Accepted: 09 January 2017. Published online: 10 February 2017. This study was supported by the National Research Foundation funded by the Ministry of Science, ICT and Future Planning (Global Frontier Program: No. NRF-2014M3A6B3063708 and Global Research Laboratory: No. NRF-2008-00580). Author Contributions: S.K. devised the structure of meta-atom and performed the theoretical deviation, and numerical analysis. N.P. conceived the idea for the top-down design of meta-atom structure, and encouraged S.K. to develop analytical model. D.M., N.P. and Y.K. checked the theoretical deviations, reviewed the manuscript, and wrote the manuscript with S.K. The authors declare no competing financial interests.

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August 19, 2023
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