Terahertz transmission properties of antimony doped tin oxide powder

Antimony doped tin oxide (ATO) powder was prepared by liquid phase chemical coprecipitation method with the SnCl45H2O and SbCl3 used as raw materials. The effects of the doping concentration of Sb on the energy gap, and the transmission characteristics in 0.2-1.6 THz were investigated. In particular, the THz time-domain and frequency-domain spectra, the absorption and shielding effect of the ATO were measured. The results indicate that, the energy gap of the ATO decreases first but then increases with the increase of the Sb doping amount. The same tendency emerges in the change of the THz absorption and shielding effect. In the 1.24-1.60 THz range, the ATO with a Sb doping amount of 9% exhibits the highest shielding efficiency of about 45 dB.