Learning Forum

[rahuldevmishra08]

How to find power density of any mode in mode solution.

[Greg Baethge]

The power density is not calculated by the FDE solver in MODE, so you would have to calculate it manually. You can calculate the power by integrating the Poynting vector. It would be something like:
power = 0.5*integrate(real(Pz), [1,2], x, y)
To get the modal area, an option is to use the effective area calculated by the solver (see this page).
Both can be obtained from the selected mode (you can use getresult)

[rahuldevmishra08]

Can you please elaborate
integrate(real(Pz), [1,2], x, y)

[Greg Baethge]

Sure, I'm using the syntax of the integrate script command. Assuming the mode is calculated in the xy plane. In our tools, the fields are usually stored as function of the position (x,y,z) and wavelength/frequency. In the integrate command, [1,2] means we integrate Pz (z component of the Poynting vector) over dimension 1 and 2 (corresponding to x and y).