The transmission enhancement of a THz pulse through an Ag/Ag₂O layer detected by terahertz time-domain spectroscopy

This paper reports a new way to detect the enhanced transmission of a THz electromagnetic wave through an Ag/Ag₂O layer by THz-TDS (time-domain spectroscopy). As the THz beam illuminates the sub-wavelength Ag particles gained by Ag₂O thermal decomposition, the evanescent wave is generated. The evanescent wave is coupled by a 500μ m-GaAs substrate, which attaches behind the Ag/Ag₂O layer, and then it transmits to the far field to be detected. The experimental results indicate that the transmitting amplitude is enhanced, as well as the frequent shifting and spectra broadening.