Hi Jie Li, thanks for posting your question. In this workflow, the BSDF is calculated using grating projection. The number of grating orders will depend on the width of the simulation region. In our initial example, this width was used to control the "resolution" of the BSDF.
For the export to Speos, the BSDF is calculated on a fixed grid. To do so, we map each grating order with a Gaussian beam of fixed width (beam_width). "beam_norm" is used as a normalisation factor to make sure power is conserved in the process.Â
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