Imaging the Stokes Vector of Backscattered THz Speckle Fields Using the Two-Channel PHASR Scanner

We present the polarimetric version of our Portable Handheld Spectral Reflection (PHASR) Scanner to directly capture terahertz speckles in the normal incidence back-scattering geometry. The images of the Stokes vector of terahertz fields are constructed with the signals collected in two orthogonal detector channels. We show that the distribution of the polarization states is strongly dependent upon the surface roughness and the illumination frequency. We investigate full polarimetric imaging by incorporating an achromatic THz quarter waveplate. This scanner can be used for rapid broadband polarimetric imaging of biomedical and industrial targets in the field.