3D FDTD simulation of spatiotemporal shaping and filtering of terahertz pulses through metal slits with finite thickness

The characteristics of spatiotemporal shaping and filtering of terahertz (THz) pulses passing through metal slits with finite thickness have been investigated by employing the finite-difference time-domain (FDTD) method. It is shown that this diffraction-based quasi-optical technique has a good influence on shaping and filtering of TEM-polarized THz pulses for thick-slits, while no effect for thin-slits. Furthermore, the numerical simulation results can be employed in the relevant experiments.