Experimental realization of negative refraction using one metasurface

A designed one metasurface metamaterial that can provide both negative permittivity and negative permeability and therefore a negative refractive index is experimentally realized in this work. Effective parameters are retrieved from the measured S parameters and are in good agreement with the numerical simulation data. Over our working frequency range, negative refractive index, index near zero, and positive index are all observed, which is confirmed by the two-dimensional wave propagation behaviour. This result can help simplify the design for negative refraction application and can further be used to fabricate negative index materials at optical wavelengths as well as three-dimensional metamaterials.