Full Polarization Power Combination Based on a Double-Near-Zero Photonic Crystal

The combined radiation power of current sources with different polarization has been investigated by manipulating of light propagation within zero-index materials. When the permittivity (permeability) of materials becomes zero, the amplitudes of transverse electric (magnetic) fields in media are a function of the position of the current sources. It was found that the amplitudes of electromagnetic fields excited in isotropic double-near-zero (DNZ) materials display a homogenous distribution, which can help to realize high-quality power combination of the full polarization radiation field. Furthermore, the DNZ metamaterial structure is designed and applied to approach full polarization power combination with multiple sources arranged in a complex pattern. In addition, the radiation field patterns of full polarization power combination could be easily controlled by changing the shape or boundary conditions of the metamaterial structure.