If the nanoparticle is irradiated with a plane-wave source moving in the downward direction of the y-axis as shown below, I can calculate the mode area using the profile monitor and index monitor by referring to this KB web page.
In the KB example the mode source is implemented on the device (instead of the plane-wave source), to calculate the mode area on the plane (xz-plane) perpendicular to the source direction (x axis). Can I apply the same mode area equation to a plane perpendicular to the source direction (xz-plane) as well as planes parallel to it (xy-,yz-planes) for this example in FDTD Solutions? I want to evaluate the field localization (such as Anderson localization) area for this system by using the mode area approach.
Could you give me some guide line for this mode area calculation with repsect to planes and a source?