Propagation characteristics of THz waves through magnetized dusty plasma with a ceramic substrate

The shift-operator finite-difference time-domain method is applied to investigate the transmission properties of terahertz (THz) waves through a fully ionized magnetized dusty plasma sheath with time-varying electron density distribution and a ceramic substrate. It is interesting and noteworthy that the inclusion of the ceramic layer induces a phenomenon whereby the transmissivity and reflectivity of THz waves exhibit a quasi-periodic variation with respect to frequency within the higher-frequency band (above 0.3 THz), which differs from previous reports. This result is also confirmed by the theoretical analysis, which shows that the oscillating-period of the transmissivity and reflectivity is inversely proportional to the thickness of the ceramic layer. Numerical simulations indicate that the left-hand circularly polarized waves penetrate the plasma model with a ceramic substrate more easily than the right-hand circularly polarized waves. Decreasing the electron density, plasma thickness, or dielectric constant of the ceramic leads to an increase in transmissivity. However, it is somewhat opposite when the external magnetic field strength decreases. Our findings maybe provide theoretical support for possible alleviating the issue of "blackout."