Rapid, voltage controlled phase modulation of continuous wave THz radiation is demonstrated. By transmitting an infrared laser beam through a phase modulator, the phase of the THz radiation which is generated by the photomixing of two infrared beams can be directly modulated through a 2π phase shift....http://www.google.de/patents/US7915587?utm_source=gb-gplus-sharePatent US7915587 - Methods of rapid phase modulation of THz radiation for high speed THz imaging, spectroscopy, and communications devices and systems
