The terahertz radiation characteristics of targets are great important for passive detection technology. Based on the large aircraft model, the electromagnetic characteristics of the surface coating of the aircraft is considered, and combined with the background radiation and transmission characteristics of the sea and air background as well as the downward observation mode, the brightness temperature images of multiple terahertz frequencies of the aircraft are calculated by using the fast ray tracing method. By studying the effects of different surface temperature and absorbing coatings on the brightness temperature image of the aircraft, the results indicate that the difference between the background and the emissivity of the aircraft plays a key role for the brightness temperature of the aircraft.
We have used Terahertz time-domain spectroscopy(TDS) to investigate the dielectric properties of water and water solutions of containing different ions. The complex permittivity of NaCl solutions, for different concentrations of ions, was obtained by attenuated total reflection(ATR) method. We have observed that, when increasing o ion concentration, the real part and imaginary part of the permittivity are increased. Furthermore, we also calculate the dielectric constant of ionic aqueous solutions with different concentrations based on molecular dynamics method. The simulation method, based on Newton mechanics, can estimate the dielectric constant of liquid substances without the experimental limitation.
Using first-principles calculations, the terahertz dielectric and thermal properties of cubic silicon carbide (3C-SiC) are investigated for a wide range of temperature ranging from 0K to 2500K with the density functional perturbation theory (DFPT) and the quasi-harmonic approximation (QHA).
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