In most of the FDTD simulations, perfectly matched layers play an indispensable role by their ability to absorb the incoming waves to mimic free space propagation. Triggering effect for this animation is the simple curiosity of what would happen if a point source was embedded in the PML rather than the inner domain. To illustrate… Continue reading What happens if the Source is Inside the PML region in FDTD simulations?
Here, the plane wave excitation using the total field / scattered field (TF/SF) formulation in finite-difference time-domain (FDTD) algorithm is demonstrated. The interface between the “total” and “scattered” field regions is shown using the square box. The plane wave polarized in the -z direction (with respect to screen surface) is injected into the medium along… Continue reading Total Field / Scattered Field (TF/SF) Implementation in FDTD
In this second video of the series, we demonstrate the case where the group velocity is zero while the phase velocity is positive number. The individual wave components comprising the total wave are first shown at the top along with a corresponding “dot” representing the phase velocity of each component. In the bottom figure, we… Continue reading Group Velocity / Phase Velocity Animation – Case 2: Zero Group Velocity
Time-progress animation of Fourier transform for varying input signal