Negative refraction demultiplexer metamaterial for millimeter waves

In this work, by using an extraordinary transmission metamaterial prism and taking advance of its inherent dispersive behavior, the feasibility of manufacturing a multiplexer/demultiplexer at millimeter-wave is shown. Depending on the incoming beam frequency, the outgoing beam suffers a different deflection (governed by Snell's law). Since the frequency dependent index of refraction of this metamaterial can go from almost zero to -2 for the first propagation band, different negative outgoing angles can be obtained and then, diverse paths for each frequency, as the near-field experimental results confirm.