The fields go to infinity, and the software stops. This is usually caused by an aggressive custom mesh overrides, poorly fit material models with negative imaginary refractive indices (gain), or grazing angles on PML boundaries. Fix this by refining the material fit or increasing the PML layers.

: old third-party PDFs from 2015 (Lumerical was then independent); they may reference outdated interfaces. Always check the copyright year — 2022 or later is best.

The Lumerical FDTD (Finite-Difference Time-Domain) method is a numerical technique used to solve Maxwell's equations in electromagnetics. Here's a detailed story covering the basics of Lumerical FDTD and a step-by-step tutorial:

The definitive starting point is the official Ansys website. Ansys provides structured learning pathways specifically for Lumerical FDTD.

The most reliable, up-to-date documentation comes directly from the Ansys Innovation Space and the Ansys Learning Hub. Ansys Innovation Courses

Do you plan to use , or do you prefer using the graphical user interface (GUI)? Share public link

Lumerical FDTD is an industry-standard solver for nanophotonics, CMOS image sensors, metamaterials, and plasmonics. Because its 3D Maxwell’s equations solver relies on complex mesh settings, boundary conditions (PML, periodic), and material models, a high-quality tutorial PDF is essential for both beginners and advanced users.

Add a rectangle for the substrate (SiO2) and a smaller rectangle on top for the waveguide core (Silicon:

Here are some best practices for using Lumerical FDTD:

Self-paced courses offer a logical progression from beginner to advanced topics: Ansys Lumerical FDTD –Learning Track

Many physics and electrical engineering departments host standard operating procedures (SOPs) and lab manuals online. Search Google using specific filetype filters to find them:

To get started with Lumerical FDTD, you need to download and install the software from the Lumerical website. Once installed, launch the software and create a new project.