How to creat TE plane wave in Comsol 4.0 RF module

I am a new player in Comsol 4.0.

My question is : How to creat ideal TE plane wave in Comsol 4.0 RF module?
How can we know the wave produced is an TE plane wave?

I tried three methods as mentioned in several models: electric field boundary condition, surface current density boundary condition and scattering boundary condition. But I don't know whether I have obtained the ideal TE plane wave? (the attached image is produced by using the electric filed boundary condition: set Ez=1; Ex=0;Ey=0).

Is it wrong or not?

Thanks in advance!