Experimental Demonstration of Isotropic Negative Permeability in a Three-Dimensional Dielectric Composite
State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China. Physical Review Letters
(Impact Factor: 7.51).
08/2008; 101(2):027402. DOI: 10.1103/PhysRevLett.101.027402
Isotropic negative permeability resulting from Mie resonance is demonstrated in a three-dimensional (3D) dielectric composite consisting of an array of dielectric cubes. A strong subwavelength magnetic resonance, corresponding to the first Mie resonance, was excited in dielectric cubes by electromagnetic wave. Negative permeability is verified in the magnetic resonance area via microwave measurement and the dispersion properties. The resonance relies on the size and permittivity of the cubes. It is promising for construction of novel isotropic 3D left-handed materials with a simple structure.
Available from: Jorik Van de Groep
- "High-index dielectric particles support both electric and magnetic modes in the visible and near-IR spectral range [1,13141516. Interference between the magnetic dipolar (MD) and electric dipolar (ED) modes can be used to engineer strongly directional scattering profiles171819, and realize all-dielectric low-loss metamaterials20212223 and metasurfaces [24,25]. To fully exploit the potential of dielectric resonators in more complex structures and devices, a fundamental understanding of the resonant properties of individual nanoparticles is essential. "
- "Recently, high-permittivity dielectric particles have also attracted attention as promising building blocks of artificial magnetic media . The Mie-type magnetic resonances of dielectric particles have been studied theoretically       and demonstrated experimentally in the gigahertz  , terahertz  , mid-infrared  , and visible  spectral ranges. Mie resonance-based metamaterials offer lower Joule losses and higher isotropy as compared to more standard metallic resonant structures, such as split ring resonators . "
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ABSTRACT: We consider a planar resonator made of a thin, high-permittivity dielectric ring coated on one side with graphene. It is shown that the resonant magnetic response of the ring to an axially applied time-harmonic magnetic field can be efficiently controlled by electrical gating of the graphene coating. Variations of the resonance frequencies and quality factors with the Fermi energy of graphene are investigated for the micrometer- and centimeter-size rings operating in the terahertz and gigahertz frequency ranges.
- "The interference between the electric and magnetic resonances can affect strongly the scattering properties of the particlesuch as the directionality of scatteringand complete suppression of the backward scattering. Different numerical techniques of the full-wave electromagnetic simulation, such as finite-difference time-domain (FDTD) method[14,15], modified discrete dipole approximation (DDA)[16,17], and finite-integral frequency-domain (FIFD, CST Microwave Studio) method[5,17], have been used to study the electric and magnetic resonances in nonspherical dielectric particles. Particles of cubic[15,16], conical, and cylindrical14151617shape were investigated. "
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ABSTRACT: We develop a simple semi-analytical approach for calculating the magnetic response of rotationally symmetric high-permittivity dielectric particles to an axially applied magnetic field. By using this approach, magnetic resonances of dielectric rings of arbitrary width and thickness and of dielectric cones with arbitrary height-to-diameter aspect ratio are studied. The approach is validated by a comparison with the results of rigorous numerical simulations using the Maxwell equations.
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