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

[Kirill]

Hello pm796,

Thank you for being an active participant in our forum. It’s always a pleasure to see your engagement!

To answer your first question — no, you don’t need extra offsets to simulate an infinite plane wave. The wave propagation appearance results from combining the correct source and corresponding boundary conditions. You can think of the injection plane as an aperture for the infinite plane wave, where the wave angle translates into the corresponding phase distribution at the injection plane. To avoid diffraction effects, Bloch boundary conditions should be applied. Also consider using Broadband Fixed Angle Source Technique (BFAST) with broadband source.

For your second question, I’d recommend watching at least two videos from this part of the course: Plane Wave Source in Ansys Lumerical FDTD — Lesson 2.

Best regards,

Kirill