Space-Frequency Imaging of a Terahertz Waveguide Using Synthetic Aperture Technique

We introduce an innovative method for imaging the spectral profile of a terahertz (THz) waveguide's output beam. Our proposed approach is based on the synthetic aperture (SA) imaging technique integrated into a time domain spectroscopy (TDS) system in transmission configuration. Using this approach, we demonstrate the reconstruction of space-frequency maps, and two-dimensional transverse images at different frequencies of the guided beam at the output of the THz waveguide under test. These outcomes mark a significant step forward in the development of characterization methods of THz waveguides.