Mechanically Tunable Wire Metamaterial

In this work we propose a new quasianalytical way of obtaining the plasma frequency of a wire medium consisting of two identical sublattices with the aim of mechanically tuning it by adjusting their relative position. Such tuning is required by the new application of the wire medium as a component of proposed detectors of axion dark matter. A dispersion equation for such a metamaterial is given and the results of solving it numerically are plotted for two different geometries of the sublattice. A tuning percentage of about 30% is demonstrated for both.