Hi,
Thanks for the comment. The goal is to observe the backward wave in metamaterial structure, so I need to keep the phase term, and Mag_E is the option, so far so good. But after plotting, the only useful colormap style is rainbow, right? But the wave style would be much better in this work, wave style range is [-1 1] so maximum and minimum of the field are different in color rather than in rainbow style, and it would make it much easier to see backward wave in more complex structures. And that's what I am looking for.