Electrooptic sensing for antenna characterization and propagation investigation at THz band

We show the two applications of an electrooptic sensing which is based on a nonpolarimetric frequency down conversion technique at terahertz frequency band. We demonstrate the near-field measurement and far-field characterization of a Cassegrain antenna at 300 GHz. We also demonstrate the visualization of a wave packet propagation in a free space at 120 GHz.