There is not propagation inside the waveguide
I have a silicon waveguide 5um x 220nm which, the BOX and the cladding are SiO2. I use a mode source and I select the fundamental mode to be propagated. I had used the mode source and that waveguide dimensions in another application and it seemed to work well, but here it doesn't work. I would like to plot the E field in the waveguide by using a frequency domain field and power monitor.
The result of the E field is
From the visualizer, we can see that there is not propagating in the waveguide. I was expecting the wave to travel inside the waveguide. Why that happens and how can I fix it?