Learning Forum

[Greg Baethge]

In FDTD simulations, each field components is calculated at different spatial location within the mesh cell. This can lead to confusion about where it is valid to put monitors, when they are close to other objects. For example, can a time monitor be right at the edge of the simulation region, or does it need to be a few mesh points away from the boundary?

This topic describes how close monitors can be to other objects.

Solvers: FDTD, varFDTD

[MikeS]

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Thanks greg_baethge , this is very helpful. I was wondering however what happens when the source and/or the monitors are rotated, like in the image below. Is this situation valid? The unrotated instances are those, in respect to which the distances should be respected?

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[Greg Baethge]

Hi Array,
Thanks for posting you question. Actually, it shouldn't matter for the rotated source/mode expansion monitor: in any case, the rotated bit is only use to get the correct waveguide cross section and correctly calculate the mode (either used to generate the source or for the mode expansion). The source injection can only be in a plane/line parallel to the axis and same for the monitors.

[MikeS]

Great, thank!