# calculate integral of field intensity

Hello,
How can I calculate the integral of field intensity over a 2D monitor?
My structure link is below without graphene:
https://kx.lumerical.com/t/transmission-in-gold-ring-resoanator

I want to calculate the integral of field intensity top of graphene layer with and without EOT structure to simulate below figure:

My simulation file with graphene is below:
best gold1 - Copy.fsp (256.9 KB)

Thank you
Mehrabi

Dear @keyan.mehrabi

This page has an example how you can find the transmitted power over a monitor which is Y-normal.The output is transmission as a function of frequency. With a little bit of adjustments (such as replacing real(Py) with field intensity) I guess you can get results that you are looking for.