Hi,

Does anyone know how could I calculate the flow of photons with a 
particular propagation direction that go through the detector 
(flux-region) while ignoring those photons that also go through the 
flux-region but have a different propagation angle? For example, say 
that you have a diffraction grating and want to calculate the 
transmission intensity of a particular diffracted order. Is it 
possible to introduce a flux-region that can discriminate photons 
with different propagation directions?

Thanks,
         Floren


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