Electromagnetic wave and polarization

The fields in an electromagnetic wave moving along the X axis are
E = Ey cos(kx-ωt) j + Ez cos(kx-ωt+δ) k
B = Bz cos(kx-ωt) k - By cos(kx-ωt+δ) j = (c×E)/c2
where c = c i, Bz = Ey/c and By = Ez/c. Units are chosen so that c = 1. Below you can choose the amplitudes Ey and Ez, as well as the wavelength λ = 2π/k and the relative phase δ.