Retrieve and process data (like transmission or field profiles) from monitors. 2. Setting Up Your First Simulation
Monitors collect the electromagnetic field data generated during the simulation run. They do not affect the simulation physics, but adding too many can consume excessive RAM.
: The most common monitor type. It calculates transmission, reflection, and spatial field profiles ( ) via a Fourier transform.
The fields approach infinity, and the simulation terminates. lumerical fdtd tutorial
: Setting the spatial bounds, grid mesh size, and boundary behaviors.
Observe the to track calculation progress. Ensure the autoshutoff level drops below 10-510 to the negative 5 power to guarantee convergence.
Running and Validating Simulations Scripting and Automation Best Practices for Efficiency 1. What is Lumerical FDTD? Retrieve and process data (like transmission or field
Resolves steep field gradients without slowing down the whole simulation. 10-510 to the negative 5 power 10-610 to the negative 6 power . Do not stop simulations prematurely.
Use the Lumerical Script File (.lsf) to automate data extraction. For example, transmission("monitor_name"); will return the fraction of power flowing through that monitor. 6. Common Pitfalls to Avoid
Add a Rectangle on top of the substrate. Set width ( and height ( . Set material to Si (Silicon) - Palik . Add FDTD Region: Enclose a segment of the waveguide. Set -min before the waveguide starts, and -max past its end. Set boundaries to PML on all sides. Add Mode Source: Place it at the start of the waveguide ( -min). Click "Select Mode" and choose the fundamental TEcap T cap E mode. Set the wavelength range from They do not affect the simulation physics, but
Set the mesh size (smaller mesh = higher accuracy but slower speed).
If your structure has symmetry, use it to reduce the simulation volume by a factor of 2 or 4.
This is the "bread and butter" monitor. It calculates Transmission (T) and Reflection (R).