- This lesson utilizes 2D layout to demonstrate usage of Lorentz-Drude materials in OptiFDTD simulations.
- Materials in this layout can be switched to perfect conductor or other metals to observe their interaction with the optical field
- 3D simulation for Lorentz-Drude material has the same concept as 2D simulation. However, if Lorentz-Drude material in 3D layout touches the boundary, the corresponding Anisotropic PML will use the air instead. This approach has been chosen, since calculations for Lorentz-Drude material in Anisotropic PML consume too much time and memory.
- Lorentz-Drude material needs very fine mesh. In general the mesh size should be at least 2 percent of the smallest simulated wavelength. A large mesh size will render the FDTD method algorithm unstable. The FDTD scheme for coarse mesh is unable to properly represent quick changes in signal attenuation within a few mesh points.