Thin-film spatial filters.

@article{Moreno2005ThinfilmSF,
  title={Thin-film spatial filters.},
  author={Ivan Moreno and J. J. Araiza and Maximino Avenda{\~n}o-Alejo},
  journal={Optics letters},
  year={2005},
  volume={30 8},
  pages={
          914-6
        }
}
A thin-film optical filter used as a one-dimensional spatial filter is presented, and its design is briefly examined. The filter consists of a stack of quarter-wave dielectric layers upon a right-angle prism that selectively cancel a reflected or transmitted plane-wave front for various angles of incidence. Transmittance and reflectance are low-pass functions or high-pass functions of the angle of incidence with a high degree of steepness. In combination, these filters exhibit bandpass… 
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