Ansys Lumerical FDTD (Finite-Difference Time-Domain) is the industry-standard software for modeling nanophotonic devices, metamaterials, and integrated optical circuits. Finding a comprehensive, structured guide can be challenging, as documentation is often scattered across forums and application notes.
Exploits device symmetry to reduce simulation time and memory usage by up to 75%. 3. Mesh Settings Mesh size directly dictates accuracy and simulation time.
Material explorer fit lines match the experimental data points closely. lumerical fdtd tutorial pdf
A structured setup prevents convergence issues and saves computational time.
The central window. It displays your simulation in 2D or 3D perspectives (XY, XZ, YZ views). A structured setup prevents convergence issues and saves
Sometimes simulations crash, and field amplitudes spike to infinity. This is known as divergence. Prevent it by checking the following parameters: Found in FDTD options (default: 10-510 to the negative 5 power
For structure building, pay attention to coordinate inputs to ensure precise geometry. For a blazed grating example, you might set polygon vertices at coordinates (0,0), (Λ,0), (Λ,h) to achieve the correct blaze angle. For a blazed grating example
, the fundamental workflow follows a structured sequence of setup and analysis. 1. Fundamental Concepts The FDTD Method
Once you have mastered the basics through PDF tutorials, consider these advanced topics:
For complex papers, manual setup is inefficient. Use .lsf scripts or the Python API to:
Before launching massive simulation loops, keep these optimization rules in mind to save hours of computing time: