If you cannot afford a license, consider using open-source FDTD solvers, such as (developed by MIT), which is highly capable, though it lacks the user-friendly CAD environment of Lumerical.
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The Finite-Difference Time-Domain (FDTD) method is a popular numerical technique used to solve partial differential equations in various fields, including electromagnetics, acoustics, and fluid dynamics. In this review, we will discuss the fixed crack solutions for numerical FDTD methods, which are essential for ensuring the accuracy and reliability of the simulations. The Finite-Difference Time-Domain (FDTD) method is a popular
To fix these cracks or instabilities, several techniques can be employed: