Reply To: Illumination with an incident angle greater than 0° FDTD

[Kirill]

Hello Giovanni,

Obtaining meaningful results from an FDTD simulation can be challenging.

I’d suggest starting with this article: Periodic Boundary Conditions in FDTD and MODE. It includes an “Additional Tips” section that might help you get up to speed with your simulation.

Basically, use Bloch BC in the direction of angled incidence for a single frequency case, or BFAST for broadband simulation. Use Periodic BC in another direction, and PML with 'Steep angle' profile on top and bottom.

If you still have questions, I highly recommend the Ansys Lumerical FDTD course, which provides a solid overview of all the essential steps for FDTD simulation.

You might also want to check the Application Gallery (APP) for relevant examples.

Best regards,
Kirill