Kazuma Yamashita

Thank you for your reply.

Now I understand that the reason why 2D FDTD simulations give unexpected definition of polarization comes from the definition of field components in 2D FDTD:

TE:   Ex, Ey, Hz

TM:   Hx, Hy, Ez

But I am wondering why the TE mode can be called TE (transverse electric) in this definition. What is the TE wave (Ex, Ey) transverse to?