FDTD discretizes time and space using a staggered orthogonal grid known as the Yee cell.
Reduce the time step factor (dt factor) below 0.99; check material fits for negative values. Simulation stopped too early
FDTD uses a discrete mesh. The default auto-mesh settings (Accuracy 1 to 8) are usually sufficient. For critical regions like thin metal films or waveguide gaps, add a Mesh Constraint region to force a finer grid size ( Step 3: Sources and Monitors Sources:
A single pulse calculates device response across a wide frequency spectrum. lumerical fdtd tutorial pdf
Confirm your geometry and material boundaries are correctly meshed.
I can generate the exact or walk you through the structural parameters for your setup. Share public link
For flat surfaces, thin films, and periodic structures. FDTD discretizes time and space using a staggered
The simulation ends when the fields decay to a fraction of the injected energy. If your transmission data looks noisy or artificial ripples appear, decrease the auto-shutoff minimum threshold (e.g., from 10-510 to the negative 5 power 10-710 to the negative 7 power ) and increase the maximum simulation time.
Ultimate Guide to Ansys Lumerical FDTD: Step-by-Step Tutorial and Resources
-axis). It runs incredibly fast but ignores out-of-plane scattering. The default auto-mesh settings (Accuracy 1 to 8)
: Absorbs outgoing waves to simulate open space.
After the simulation finishes (the "Analysis" mode), right-click your monitors to "Visualize" the results.
Building a simulation in Lumerical FDTD follows a strict, logical sequence. 1. Geometric Setup
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