Abstract: A terahertz time-domain spectroscopic ellipsometry system includes a sample stage, a terahertz emitter configured to provide pulses of terahertz radiation with preselected polarization components to illuminate a sample on the sample stage along an incident direction, and a coherent terahertz detection system arranged to coherently detect pulses of terahertz radiation from the terahertz emitter along an emerging direction after at least one of reflecting from or passing through the sample. The sample stage is rotatable to vary a relative angle between the incident direction and the emerging direction, and the coherent terahertz detection system substantially maintains alignment for amplitude and polarization detection as the relative angle is varied.

Abstract: A terahertz time-domain spectroscopic ellipsometry system includes a sample stage, a terahertz emitter configured to provide pulses of terahertz radiation with preselected polarization components to illuminate a sample on the sample stage along an incident direction, and a coherent terahertz detection system arranged to coherently detect pulses of terahertz radiation from the terahertz emitter along an emerging direction after at least one of reflecting from or passing through the sample. The sample stage is rotatable to vary a relative angle between the incident direction and the emerging direction, and the coherent terahertz detection system substantially maintains alignment for amplitude and polarization detection as the relative angle is varied.

Abstract: A sensor system includes a source of input radiation having a frequency range between about 30 GHz and 3 THz, a whispering gallery mode resonator module coupled to the source for receiving the input radiation, and a detector coupled to the whispering gallery mode resonator module. The whispering gallery mode resonator module is configured to support at least one whispering gallery mode for the input radiation, and output a transmission response having a resonance characteristic related to the at least one whispering gallery mode. The detector detects the transmission response.

Abstract: Apparatus for carrying a plurality of photoconductive antennas is configured to facilitate the independent application of a voltage bias to each of the photoconductive antennas. The apparatus includes a carrier device, which comprises a support member configured for supporting a substrate containing a plurality of photoconductive integrated circuits. The support member has a side edge and a central portion having a window therein shaped for exposing the plurality of photoconductive integrated circuits to an incident optical beam. At least three contact plates are positioned on the central portion of the support member adjacent the window, and are configured to be electrically connected to an electrode of one of the photoconductive integrated circuits and to an electrode of another one of the photoconductive integrated circuits. At least two pairs of input terminals are located on the support member adjacent the side edge thereof, and are spaced from each other.