Fields polarization

[poutine-dejeuner]

With the source below, I am getting electric fields with only a z component and magnetic fields with both x and y components. How should I set the source if I want to have an electric field with both x and y components?

source_center  = [-Sx/2 + pml_size + waveguide_length/3,0,0]
# source_center  = [-Sx/2 + pml_size - waveguide_length,0,0]
source_size = mp.Vector3(0,waveguide_width, 0) #mp.Vector3(0,2,0)
kpoint = mp.Vector3(1,0,0)
src = mp.GaussianSource(frequency=fcen,fwidth=fwidth)
source = [mp.EigenModeSource(src,
                            eig_band=1,
                            direction=mp.NO_DIRECTION,
                            eig_kpoint=kpoint,
                            size=source_size,
                            center=source_center,
                            eig_parity=mp.ODD_Z+mp.EVEN_Y)]

[peterropac]

You are getting a Z polarized source due to your eig_parity and the geometry, which I guess constrain the fundamental mode to be Z polarized. The easiest way is to create another source with eig_parity=mp.ODD_Y.