Finite Different Time-Domain Simulation of Terahertz Waves Propagation Through Unmagnetized Plasma

In order to support ongoing terahertz time-domain spectroscopic experiments involving plasma characterization, it is beneficial to simulate the interaction of THz pulses with varying plasma configurations. In this approach, a 1-D Finite Difference Time Domain (FDTD) model was constructed to simulate the interaction of terahertz radiation with a plasma medium. In order to incorporate the plasma properties into the simulation, a Z-transformation was applied. This model is capable of simulating the following properties of plasmas including electron density, collision frequency, and the interaction length of the plasma medium. The simulated model was characterized using terahertz time-domain spectroscopy. The effects of electron density, collision frequency, and the interaction length of the plasma medium on the amplitude and phase of the terahertz pulse were studied and calculated values of electron density were compared with the values used in simulation