Is this periodic strucutre or isolate ?
For periodic structures, you will need to use plane wave and periodic BCs and use grating analysis to get results of diffraction: Diffraction grating
if it is isolated, you will need to use TFSF source to quantify the scattering: Mie scattering (FDTD)
you sais the illumination is non-polarized. Please refer to this link:
Polarization incoherence
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