Boundary Conditions

The basic FDTD algorithm must be modified at the boundaries of the computational window where suitable numerical absorbing boundary conditions (ABC) are applied. This is one of the most challenging parts of FDTD simulations. There are several choices for the type of boundary conditions. The Perfectly Matched Layer (PML) boundary conditions have the best performance.…

OptiFDTD now has options to use Perfect Electrical Conductor (PEC) and Perfect Magnetic Conductor (PMC) boundary conditions. You can choose which boundaries use the new conditions, and Anisotropic PML can be used for the remaining boundaries. With this PEC/PMC/Anisotropic PML combination, the following simulations may be obtained: Plane wave simulation Domain reduced simulation for symmetric,…

This version of OptiFDTD provides the option to use simplified Periodic Boundary Condition (PBC). PBC can work with other boundary conditions such as Anisotropic PML, PMC, and PEC. With PBC, you can generate a simple plane wave simulation or periodic layout simulations. The simplified PBC is based on the Bloch’s Theorem: For the periodic layout,…