Linear Dichroism in High Temperature Superconductors in THz Range

We measure as a function of sample orientation, doping, temperature, and energy, the Faraday rotation of linearly polarized THz light by high temperature cuprate superconductors. We observe a linear dichroism signal which increases with decreasing frequency and may exhibit resonances in the THz (1-6 meV) range. Preliminary results also show strong temperature dependence to the Faraday rotation signal.