Negative Index Metamaterial for Selective Angular Separation of Microwaves by Polarization

We have demonstrated that an anisotropic metamaterial prism comprises both positive and negative indices. Such a prism can split an incident beam refractively. The values of the positive and negative index and the apex angle of the prism determine the separation angle of the output beams. The positive and negative indices are accessible by the choice of polarization of the incident radiation. Using linearly polarized radiation with the electric field vector parallel to the posts in the prism, negative refraction is observed. Rotating the polarized beam 900 yields a positively refracted signal. Intermediate angles of polarization can achieve refraction in both negative and positive directions simultaneously.