Spatial-frequency multiplication with multilevel interference lithography

@article{Chang2008SpatialfrequencyMW,
  title={Spatial-frequency multiplication with multilevel interference lithography},
  author={Chih‐Hao Chang and Yong Zhao and Ralf K. Heilmann and Mark L. Schattenburg},
  journal={Journal of Vacuum Science \& Technology B},
  year={2008},
  volume={26},
  pages={2135-2138}
}
The authors present a large-area spatial-frequency multiplication fabrication process for patterning one-dimensional periodic structures using multilevel interference lithography. In this process, multiple grating levels with different phase offsets are overlaid by aligning to a reference grating. Each grating level is pattern transfered into a single hard mask layer, effectively reducing the grating period. The linewidth of the grating lines is controlled with nanometer repeatability by plasma… 
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