Building a reliable THz material library

Compared to the millimeter wave and SHF microwave, the huge bandwidth available at TeraHertz (THz) frequency makes it attractive for future data transmission and networking use. Although THz frequency signals are highly absorbed by the gases of the atmosphere, they are still very promising for high-bandwidth wireless networking systems, especially indoor systems. This report analyzed the material characterization of around hundred common indoor materials which can be classified as fabric, leather, wood, stone and plastics by using THz Time Domain Spectroscopy technique. Materials were measured with Toptica TeraFlash Pro Dual in both collimated and focused beam transmission configuration and then analyzed using the commercial software Teralyzer to acquire properties of refraction index, absorption coefficient, permittivity, and loss tangent. The results at 0.3 and 0.45THz are singled-out and further analyzed given the prospect of these frequencies for future 6G communication. An intercomparison of the results from Toptica TeraFlash Pro Dual, Menlo Tera K15 and Keysight N5247B PNA-X with VDI extenders was carried out to understand the influence of the system in the material extraction process and build up a reliable material library.