This is where FDTD differs from other solvers. The tutorial must explain how to define the simulation span and, more importantly, how to set boundary conditions (PML, Periodic, Bloch). It should also introduce mesh override regions—essential for ensuring the mesh is fine enough to capture small geometric features like a thin gold layer or a narrow gap.

Many universities offer photonics courses with publicly accessible Lumerical FDTD tutorial PDF files. Examples include:

Search with keywords: site:edu "Lumerical FDTD" tutorial pdf

  • Introduction to FDTD and numerical concepts

  • User interface and workflow

  • Step-by-step example problems (the heart of a tutorial)

  • Advanced topics

  • Best practices and troubleshooting

  • Appendices

    • Some technical creators (e.g., "Photonics Academy," "NEOLab") offer PDF downloads linked to their video tutorials. While not official, these are often practical and beginner-friendly.