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Perfect absorption of electromagnetic (EM) microwaves using metamaterials (MMs) has been investigated greatly these days for the potential applications in EM compatibility, solar energy, bolometer, sensor, etc‥ The problem of EM noise comes to be more serious according to the advent of ubiquitous society. Extended dissemination of high-speed and high-frequency digital products and smart equipments...
We present dual-band metamaterial absorbers that are composed of concentric metal double rings, a dielectric spacer and a metallic ground plane. The coupling between the top electric resonators and the bottom metal layer leads to a strong magnetic resonance. The metamaterial with ordered double rings has two absorption peaks at frequencies of 5.67 GHz and 11.30 GHz with the absorption rates of 99...
Weyl point is a topological singular point in the momentum space. There are two types of Weyl points, type-I and type-II, both are topologically nontrivial but exhibit very different physical properties. For instance, the density of state is zero at a type-I Weyl point; while that of type-II Weyl point is rather large just like the hyperbolic metamaterials. Up to now, there has not been any exploration...
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