Polarization-sensitive THz-TDS and its Application to Anisotropy Sensing

We review recent progress in polarization-sensitive time-domain spectroscopy at THz frequencies (THz-TDS). Developments in spectroscopic polarimetry and ellipsometry and various polarization components targeting THz frequencies are introduced. Polarization-sensitive measurements are suitable for studying the anisotropic responses of materials induced by factors such as structure, stress, and magnetic fields. Examples of observations of anisotropic characteristics of materials such as birefringence, optical activity, and magneto-optic effects are also presented.