Abstract
The theoretical basis and experimental verification of resonant phenomena in the electromagnetic fields generated by displacement current in the near zone of dielectric ring is presented. According to the traditional viewpoint, the dielectric has an influence on the electric field inside resonator. To the contrary, we demonstrate that the dielectric ring exhibits magnetic properties at resonance. The sliding incidence of plane microwave on this weakly absorbing ring is shown to provide the sharp and deep resonance in the components of generated field; this low loss circuit is operating as a resonant dielectric magnetic dipole. Splitting and broadening of resonance in the pair of these dipoles dependent upon their mutual arrangement is recorded. The phase shift equal to π between the magnetic components of incident and generated wave indicating the formation of negative magnetic response is demonstrated. Perspectives of using of this simple sub wavelength resonant magnetic dipoles in the all-dielectric circuitry are discussed.
Highlights
This paper is devoted to the unusual resonant properties of electric and magnetic fields generated in the vicinity of dielectric rings due to sliding incidence of electromagnetic waves on these rings
This research is aimed at the theoretical analysis and experimental verifications of resonant effects in the excitement of electromagnetic fields in the near zones of dielectric rings, irradiated by plane microwaves; Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, 125412, Russia
Unlike the resonance in split-ring resonators, stipulated by conductivity currents, resonance in dielectric rings is linked with the displacement currents
Summary
This paper is devoted to the unusual resonant properties of electric and magnetic fields generated in the vicinity of dielectric rings due to sliding incidence of electromagnetic waves on these rings. Pendry et al.[10] pointed out, that such metamaterial can be designed by a kind of conductive horse-shoe-like circuits with splits (SRR), possessing the classical LC- resonance; two years later it was experimentally realized by Shelby et al.[11] These results, obtained for microwaves, were rescaled for conductive currents in the nanoscale SRR operating in the THz range[12,13]. The examples of inductance excited by displacement currents in non-metallic elements and providing the formation of resonant frequencies were calculated for all-dielectric cylinders[17] and rings[18]. To the contrary we’ll investigate the microwave field in the near zone of magnetic dipole, formed by displacement current-carrying dielectric ring, and it’s resonant properties stipulated by it’s finite sizes. The flow Φ is distinguished from Φ0 exp (−iωt) due to self-inductance of the ring
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