Source fields at the location of the source for phase de-embeding

[Nikolaos-Matthaiakakis]

Hello everyone,

I was wondering if there is a way to directly obtain the fields of the source directly at the location of the source instead of at a field monitor a certain distance away. this would help a lot in using it as a reference for calculating the reflection and transmission coefficients of the system under study and then de-embeding the phase in the reflection and transmission monitors.

Thank you

[momchil-flex]

There is no direct way to record it in the simulation, but if you're using a mode source or a beam source you can use either the mode solver or the BeamProfile module. What kind of source are you talking about?

[Nikolaos-Matthaiakakis]

Thank you, this is my source

    plane_wave = td.PlaneWave(
        center=center_src,
        size=(td.inf, td.inf, 0),
        source_time=td.GaussianPulse(freq0=freq0, fwidth=f_width),
        direction="-",
        angle_phi=angle_az,
        angle_theta=angle_inc,
    )

I guess I need to use a reference run and take into account the location of the reference monitor then

[momchil-flex]

No, for a plane wave you can use the BeamProfile module. Check out this exmaple. The source uses the same under the hood to generate the injection currents.

[momchil-flex]

I mean, the example is much more advanced, you can directly use https://docs.flexcompute.com/projects/tidy3d/en/latest/api/_autosummary/tidy3d.PlaneWaveBeamProfile.html, you don't need to define a custom BeamProfile subclass, but the example shows you how to get the fields from it.

[Nikolaos-Matthaiakakis]

Thank you, I will have a look