I’ve tried to simulate a wedge waveguide in MODE solutions. When I am getting the confinement of the waveguide, I found that the fraction of the power in some specific area sometimes is larger than 100%. But the fraction of the power in the whole simulation area is still 100%. Does this mean some wave are traveling backward direction that caused negative power? If so, how to get the exact confinement under this situation?
(The license I used is belonging to the umassb)