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A novel electromagnetic energy squeezing mechanism is proposed based on thespecial properties of permeability-near-zero metamaterials. Nearly no energystream can enter a conventional dielectric region positioned inside apermeability-near-zero material. When a source is surrounded by a dielectricsplit ring (encloser with a gap opened), the electromagnetic energy generatedby the source is forced to propagate through the gap. When the gap is narrow,the energy stream density becomes very large and makes the magnetic fieldenhanced drastically in the gap. The narrow gap can be long and bended. Thisprovides us a method to obtain strong magnetic field without using resonanceenhancement.

Squeezing electromagnetic energy with a dielectric split ring inside a permeability-near-zero metamaterial