Grating1d - Gaussian beam source

[EpicurusOfSamos]

Hi,

How can I change the polarization of the Gaussian beam while maintaining the coupling angle? In the example, the simulation is placed in the xz plane and the Gaussian beam is polarized along the y-axis, I would like to keep the k in this position and place the polarization over the x-axis, is it possible?

I tried with the below code, but it leads with fields in the x- and z-axis.

sources=[
maxwell.GaussianSource(
w0=params.beam_width / 2,
center=[
params.coupler_len / 2, 0,
params.wg_thickness + params.beam_dist
],
extents=[params.beam_extents, 0, 0],
normal=[0, 0, -1],
power=1,
theta=np.deg2rad(params.source_angle_deg),
psi=np.pi / 2,
polarization_angle= - np.pi / 2,
normalize_by_sim=True)