Polarisation-sensitive terahertz detection by multicontact   photoconductive receivers
  We have developed a terahertz radiation detector that measures both the amplitude and polarization of the electric field as a function of time. The device is a three-contact photoconductive receiver designed so that two orthogonal electric-field components of an arbitrary polarized electromagnetic wave may be detected simultaneously. The detector was fabricated on Fe+ ion-implanted InP. Polarization-sensitive detection is demonstrated with an extinction ratio better than 100:1. This type of device will have immediate application in studies of birefringent and optically active materials in the far-infrared region of the spectrum. 
E. Castro-Camus, J. Lloyd-Hughes, M.B. Johnston, M.D. Fraser, H.H.   Tan, C. Jagadish