Experimental Demonstration of Isotropic Negative Permeability in a Three-Dimensional Dielectric Composite
ABSTRACT 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.
- SourceAvailable from: Liwei Zhang
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- "In order to make devices such as double-channeled filtering based on defective PC compact and tunable, metamaterials can be intro- duced. Metamaterials, including double negative materials   and single negative materials     have attracted intensive studies in the past few years. There are two kinds of single negative (SNG) materials: one is the -negative (ENG) media and the other is the -negative (MNG) media. "
ABSTRACT: Double defect modes are found in one-dimensional dielectric photonic crystal with a single-negative material defect. The frequency and the frequency interval of the two defect modes can be tuned just by changing the permittivity, permeability and the thickness of the defect layer respectively. At the frequencies of the defect modes, the electric fields are strongly localized at the interfaces between the defect layer and its adjacent layers. Such properties can be explained by the single negative material tunneling effect where the finite-size dielectric photonic band gap can mimic one kind of effective single negative material.Optik - International Journal for Light and Electron Optics 02/2014; 125(3):1354-1357. DOI:10.1016/j.ijleo.2013.08.026 · 0.68 Impact Factor
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ABSTRACT: We have investigated the process which establishes the tunneling mode in a conjugately matched pair consisting of ε-negative (ENG) and μ-negative (MNG) materials in theory and experiment. The one-dimensional conjugately matched pairs is realized by two L-C loaded transmission lines and the dynamical behavior of the transmitted signal along the pair is measured and recorded on an oscilloscope. It is found that the field does not decay to zero in a finite length single negative material and the average power flow is a constant since the phase difference between electric field and magnetic field varies with the position. While for a conjugately matched ENG/MNG pair, the incident field attenuates in ENG material in the first instance and then the fields are rapidly enhanced at the ENG-MNG interface and reach the steady state due to the resonating effect of the structure. It is revealed that there is a combination of travelling wave and reactive standing wave inside the bilayer with the ratio between them varying with the position. It is also proved that the bilayer can also be treated as an open resonator, in which the charging up characteristic time is in proportion to the Q factor of the structure.IEEE Transactions on Antennas and Propagation 01/2014; 62(1):504-508. DOI:10.1109/TAP.2013.2290536 · 2.18 Impact Factor
- "high-permittivity rods . This principle was recently used in the microwave spectral range with cubes of millimeter-sized Ba 0.5 Sr 0.5 TiO 3 ceramics . By contrast, we employ a planar geometry with a onedimensional periodicity. "
Conference Paper: Tunable Metamaterials with Negative Permeability in THz Range[Show abstract] [Hide abstract]
ABSTRACT: We report on metamaterials which exhibit a tunable interval of negative effective permeability within 0.2–0.36 THz. They consist of a strontium titanate platelet, which shows a high and temperature tunable permittivity, with an array of laser engraved slits. The negative permeability then is due to a resonant confinement of the electromagnetic field within the rods. The range of negative permeability is determined by the geometry and the permittivity of the material used.IRMMW 2009 – 34rd International Conference on Infrared Millimeter, and Terahertz Waves, Busan, Korea; 09/2009