Metagrating for Single Order Diffraction with High Efficiency Based on Bianisotropic Particles

A novel metagrating is proposed to achieve single order diffraction. The proposed unit has electric and magnetic hybrid response. The unit is composed of asymmetrical patch. By introducing magnetic response, the element will break the symmetry of diffraction. One of the first order diffraction is canceled and the energy is totally reflected into the other order at 10GHz. Besides, the diffraction efficiency is higher than 80% from 9.4GHz to 11.1GHz. The simulated far field pattern shows good agreement with prediction. The proposed design provide a highly efficient method to suppress 0 and +1 order diffraction and simplify the difficulty of design, paving the way for further applications of beam steering.