fouriax.build_na_mask#
- build_na_mask(grid, *, wavelength_um, na_limit, refractive_index=1.0)#
Build a hard NA cutoff mask in spatial-frequency coordinates.
The cutoff in cycles/um is
min(na_limit, refractive_index) / wavelength_um.- Parameters:
grid (Grid)
wavelength_um (float)
na_limit (float)
refractive_index (float)
- Return type:
Array