Full polarization power combination based on a double-near-zero photonic crystal

The combined radiation power of current sources with different polarizations has been investigated through the manipulation 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 is found that the amplitudes of electromagnetic fields excited in isotropic double-near-zero (DNZ) materials display a homogenous distribution, which can help to realize a high-quality power combination of the full polarization radiation field. Furthermore, the DNZ photonic crystal (PC) 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 PC.