Enhancing magnetic near-field intensities with dielectric resonators

TL;DR

This paper demonstrates how dielectric resonators can significantly enhance magnetic near-field intensities in the GHz range, with potential applications across a broad spectrum from optics to radio frequencies.

Contribution

It provides the first detailed analysis and analytical expression of magnetic field enhancement in dielectric resonator dimers, extending understanding to various spectral domains.

Findings

Strong magnetic field intensities achieved in GHz regime

Magneto-electric couplings identified and characterized

Analytical model developed for magnetic field enhancement

Abstract

We measure strong magnetic field intensities in a subwavelength gap separating two dielectric resonators. This dimer magnetic antenna is characterized in the GHz spectral regime when considering three conditions of illumination. We detail the different magneto-electric couplings involved in the enhancement of the near magnetic field and derive the analytical expression of the magnetic field intensities. The results reported here in the GHz domain can be extended to other spectral domains since they are obtained with a dielectric permittivity 16 that can be observed in a very broad spectrum ranging from optics to radio-frequencies.