Inhomogeneous All-Dielectric Magnetic Metamaterials

TL;DR

This paper demonstrates localized electromagnetic field enhancement using inhomogeneous all-dielectric magnetic metamaterials with a gradual change in magnetic permeability, inspired by plasma physics phenomena.

Contribution

It introduces a novel inhomogeneous all-dielectric magnetic metamaterial design that achieves resonant field enhancement through Mie resonance.

Findings

Localized field enhancement observed experimentally

Magnetic permeability varies from positive to negative

Potential applications in electromagnetic wave control

Abstract

Anomalous field enhancement accompanied by resonant absorption phenomenon was originally discussed in the context of plasma physics and in applications related to radio-communications between the ground and spacecraft returning to Earth. Indeed, there is a critical period of time when all communications are lost due to the reflection/absorption of electromagnetic waves by the sheath of plasma created by a high speed vehicle re-entering the atmosphere. While detailed experimental studies of these phenomena in space are challenging, the emergence of electromagnetic metamaterials enables researchers exceptional flexibility to study them in the laboratory environment. Here, we experimentally demonstrated the localized field enhancement of the electromagnetic wave obliquely incident on a Mie-resonance-based inhomogeneous metamaterials with magnetic permeability gradually changing from positive to negative values.