Questions_scattering.fsp (309.5 KB)

I would like to calculate the absorption and scattering cross sections from a periodic structure.

I found on the lumerical website that I should use plane wave not TFSF , T and R monitors to calculate the scattering cross sections.

My questions is:

how can I get the abs and scattering cross sections from the T and R monitors ?

I found this sentence written in lumerical community “for a certain wavelength that means that 20% percent of the light coming in gets transmitted so you can interpret the transmission cross section to be 20% of the unit cell area”

it is confusing because scattering might be in air and in the substrate which means we need to consider (R +T) to calculate the scattering cross sections.

secondly, for calculation of scattering cross sections is that correct?

sigma_scattered = (Reflection (f)+Transmission (f))/ source intensity