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All-dielectric metamaterial: a ferroelectric-based scheme in the microwave range

机译:全介电超材料:基于微波的铁电方案

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Dielectric metamaterials are an attractive alternative to metallic metamaterials in order to reduce losses. Mie resonances in dielectric resonators can give rise to a resonant effective permeability or permittivity at resonance frequencies. When resonances are sufficiently enhanced permeability or permittivity can become negative. In the microwave range 2D rod-shaped or 3D cylinder-shaped resonators made of high-permittivity ferroelectric material can be used to demonstrate such phenomena. In the first part we present experimental proof for TE-modes in rod resonators in the X-band (8.20-12.40GHz) using barium strontium titanate (Ba_(0.4)Sr_(0.6)TiO_3, ε =575). In the second part we present experimental proof for modes in cylinder resonators in both the X and S-band (2.60-3.95GHz) using a commercial ceramic (ε =78). A negative index of refraction is shown in both cases.
机译:为了减少损耗,介电超材料是金属超材料的一种有吸引力的替代方案。介电共振器中的米氏共振会在共振频率下产生共振有效磁导率或介电常数。当共振充分增强时,磁导率或介电常数可能变为负值。在微波范围内,可以使用由高介电常数铁电材料制成的2D杆状或3D圆柱状谐振器来演示这种现象。在第一部分中,我们介绍了使用钛酸钡锶(Ba_(0.4)Sr_(0.6)TiO_3,ε= 575)在X波段(8.20-12.40GHz)的杆谐振器中TE模式的实验证明。在第二部分中,我们提供了使用商用陶瓷(ε= 78)在X和S波段(2.60-3.95GHz)的圆柱谐振器中的模式的实验证明。在两种情况下均显示负折射率。

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