I have a question about plotting an equi-frequency contour.
In tutorial https://kb.lumerical.com/en/diffractive_optics_pc_equifrequency_contour.html, only z component of the electric field is exist. So, only Ez is considered.
In my calculation, the x and y component of electric field are exist. How can I consider both of them?
Should I add the x and y component of the fourier-transformed electric field after taking absolute and square of these values ?